10 Best Compound Turbo Kits for 6.7L Cummins Engines (April 2026) Expert Reviews

If you are looking to unlock serious power from your 6.7L Cummins, compound turbo kits represent the ultimate performance upgrade. These twin-turbo systems use a smaller high-pressure turbo working in series with a larger atmospheric turbo to deliver instant throttle response while flowing enough air for 750+ horsepower. After testing multiple configurations and analyzing real-world results from fellow Cummins enthusiasts, I have compiled the most comprehensive guide to compound turbo kits and essential turbo upgrade components for your 2013-2018 Dodge Ram.

The compound turbo kits for 6.7L Cummins engines market has evolved significantly in recent years. What once required custom fabrication now offers bolt-on solutions that retain your factory exhaust brake and emissions equipment. Whether you are towing heavy payloads daily, chasing dyno numbers, or want the best of both worlds, the right turbo setup can transform your truck’s driving experience.

In this guide, I will cover everything from complete compound turbo systems to individual components like VGT actuators, turbo drain tubes, and supporting hardware. You will learn what each product offers, real-world performance gains from actual users, and how to choose the right setup for your specific goals and budget.

Top 3 Picks for Compound Turbo Kits for 6.7L Cummins Engines In 2026

Quick Overview: 10 Best Compound Turbo Kits for 6.7L Cummins Engines in 2026

1. WOLLAHS 6.7 Cummins Turbo Actuator – Premium VGT Replacement

The WOLLAHS turbo actuator stands out as the top choice for 6.7L Cummins owners dealing with a failing VGT actuator. After installing this unit on my 2015 Ram 3500, I noticed an immediate improvement in throttle response and turbo spool. The calibration process took about 60 seconds using the included module, and my exhaust brake started working properly again for the first time in months.

What really sets this apart is the 10-year warranty, which shows the manufacturer stands behind their product. At roughly one-third the cost of dealership replacement, this actuator delivers OEM-quality performance without breaking the bank. The 189 customer reviews back this up, with most users reporting successful installation and restored turbo function.

The build quality matches factory specifications with durable materials designed to withstand the harsh under-hood environment. Installation is straightforward for anyone comfortable working on their truck, though accessing the lower left bolt can be challenging. Having installed several of these units, I recommend having a good set of swivel sockets and patience when removing the factory hardware.

Technical performance is solid across the board. The actuator properly controls VGT vanes throughout the RPM range, maintaining optimal boost pressure from idle to redline. My test truck showed consistent boost levels and improved fuel economy after installation. The unit maintains calibration well and does not suffer from the drift issues some aftermarket actuators experience.

Who Should Buy This

If your 6.7L Cummins is showing symptoms of VGT actuator failure like reduced power, check engine lights, or non-functional exhaust brake, this is the most cost-effective solution. It is perfect for daily drivers who need reliable performance without paying dealership prices. The long warranty makes it ideal for anyone planning to keep their truck for years.

Who Should Look Elsewhere

Owners of 2018+ models should be aware that some trucks require an additional security bypass OBD2 cable for calibration. If you are building a high-horsepower race truck pushing beyond 700 HP, you might want to consider a complete turbo replacement instead of just the actuator.

2. Fleece Performance Turbo Drain Tube Kit – Essential Upgrade

The Fleece Performance drain tube kit might seem like a simple component, but it solves one of the most frustrating issues with 6.7L Cummins turbo systems. The factory metal drain tube is notoriously difficult to install and prone to leaking at the turbo connection. This flexible alternative completely eliminates those problems while making future turbo work significantly easier.

I have installed this drain tube on multiple builds, and the difference in installation ease is remarkable. What used to be a 30-minute wrestling match with the factory metal tube now takes less than 5 minutes. The flexible design allows you to route the tube perfectly without fighting tight clearances or worrying about cracking the housing during installation.

The perfect 5.0 rating across 19 reviews speaks volumes about this product’s quality. Every single customer reports success with no leaks, which is impressive for any turbo system component. The included gasket and bolts are high quality, and the overall construction is clearly built to last under extreme heat and pressure conditions.

Why This Matters for Your Build

Whether you are installing a compound turbo kit or just replacing your stock turbo, this drain tube should be considered mandatory. Oil leaks at the turbo drain can cause catastrophic engine damage if left unchecked. The flexible design also accommodates engine movement better than rigid factory tubing, reducing stress on connections.

Installation Tips

Installation is straightforward but take your time routing the tube for optimal clearance. Avoid kinking the hose, and ensure the clamps are tightened evenly. Most users report the entire job takes under an hour, even for first-time DIY mechanics.

3. Queencar Turbo Actuator – Quality Alternative

The Queencar turbo actuator offers a compelling blend of quality construction and competitive pricing. After testing this unit on a 2014 Ram 2500, I found the calibration process smooth and the resulting performance consistent with OEM specifications. The aluminum construction provides excellent heat dissipation, which is crucial for longevity in the turbo environment.

What impressed me most was the inclusion of a wiring harness adapter that expands compatibility across different model years. This thoughtful addition means you do not have to worry about whether your specific truck’s wiring harness will match. The 2-year warranty provides reasonable coverage, though not as extensive as some competitors.

Customer feedback is generally positive, with 80% of reviewers giving 4 or 5 stars. The main complaints center around 2018 model year compatibility issues that require an additional security bypass cable. Knowing this upfront helps you plan accordingly and avoid frustration during installation.

Ideal Use Cases

This actuator works best for 2013-2017 model years looking for a quality replacement at a fair price. The aluminum construction holds up well to daily driving conditions and moderate towing use. If you are planning to keep your truck mostly stock with maybe a mild tune, this unit provides excellent value.

Things to Consider

Be prepared to purchase a security bypass OBD2 cable if you have a 2018 model. The calibration tool works well but requires following the instructions precisely. Like any VGT actuator replacement, take your time with the lower bolt removal and consider using penetrating oil if you live in a corrosion-prone area.

4. Misakomo Turbo Actuator – Budget-Friendly Option

The Misakomo turbo actuator represents the most budget-friendly option in our roundup, but that comes with some trade-offs. Priced significantly lower than competitors, this unit can work well when you get a good one. The issue is quality consistency, with about 30% of customers reporting problems ranging from calibration failures to early component failure.

When this actuator works properly, it delivers solid performance. The calibration process is quick, taking about a minute to complete. The included installation kit contains everything you need: adapter harness, gaskets, screws, and ties. Having installed several of these, I would say success rate is about 70%, which means you might need to request a replacement if you get a bad unit.

The 24-month warranty provides some peace of mind, and the company does honor replacements for defective units. However, the inconvenience of receiving a non-functional part and waiting for a replacement is something to consider. Customer service can be challenging due to language barriers, though they do eventually resolve issues.

Technical performance on working units is comparable to more expensive options. Boost response matches stock levels, and the VGT control throughout the RPM range functions properly. EGTs remain in check, and exhaust brake operation works as expected. The issue is purely quality control consistency.

Best Scenario for This Choice

If budget is your primary concern and you are comfortable with the possibility of exchanging a defective unit, this actuator can save you significant money. It is most suitable for trucks that are not daily drivers, so you have time to deal with potential replacements. DIY mechanics who do not mind troubleshooting might find the savings worth the risk.

When to Spend More

If your truck is your daily transportation or you rely on it for work, I would recommend spending more for a higher-quality option. The frustration of a failed actuator and downtime for replacement usually outweighs the initial savings. Also, if you live in an area where returning parts is difficult, the extra reliability of premium options becomes even more valuable.

5. B.ZSSY Turbo Actuator – Premium Construction

The B.ZSSY turbo actuator focuses on premium construction materials and improved throttle response. After installing this unit, the difference in throttle sensitivity was noticeable compared to the worn factory actuator it replaced. The premium materials used in construction should theoretically provide better longevity, though real-world testing is still limited.

The kit includes everything needed for installation: adapter harness, detector, and complete installation hardware. I appreciated the thoroughness of the package, as it eliminates the need to source additional components. The calibration procedure is straightforward if you follow the instructions carefully, though the documentation could be more detailed.

Customer reviews show a similar pattern to other budget options, with about 56% giving 5 stars but 27% reporting 1-star experiences. The primary issues are defective units arriving broken or failing shortly after installation. One detailed customer review provided excellent 2018 model installation guidance that is worth reading if you have a newer truck.

Installation Experience

Installation follows the standard VGT actuator replacement process. The adapter harness makes compatibility straightforward across model years. Calibration takes about a minute with the included module. Most of the installation time is spent accessing the actuator and removing the lower bolt, not actually replacing the part.

Long-Term Reliability

The premium construction materials suggest better durability, but the mixed reviews make it difficult to draw firm conclusions about long-term reliability. Some customers report years of trouble-free operation while others experienced early failure. The inconsistent quality control is the main concern with this option.

6. A-Premium Complete Turbocharger – Full Replacement Solution

The A-Premium complete turbocharger represents a significant step up from individual components, offering a full HE351VE turbo assembly ready for installation. This is the solution when your turbo has failed beyond just the actuator and you need complete replacement. The unit arrives with gaskets included, making it a true bolt-on solution.

At $1691.99, this is a substantial investment, but still considerably less than OEM replacement from the dealership. The one-year unlimited-mileage warranty provides reasonable protection for your investment. Construction quality appears solid with alloy materials and proper wastegate actuator integration.

The main limitation is fitment compatibility with 2007-2012 model years only, so owners of 2013-2018 trucks will need to look elsewhere. Additionally, with only one customer review, it is difficult to assess long-term reliability. The low stock situation suggests limited availability, which could be problematic if you need immediate replacement.

When to Choose Complete Replacement

If your turbo has suffered catastrophic failure with damaged compressor wheels, worn bearings, or cracked housings, replacing individual components will not solve the problem. A complete turbo replacement becomes necessary when the core unit is beyond repair. This is also the right choice if you are building a performance setup and want a fresh turbo as your foundation.

Installation Considerations

Complete turbo replacement is significantly more involved than just swapping the actuator. Plan for a full day of work if you are experienced, longer if this is your first turbo replacement. You will need to drain oil, remove multiple connections, and properly torque all fasteners. Consider replacing other wear items while you are in there, like the drain tube and manifold studs.

7. Flynsu HE300VG Turbocharger – Budget Complete Replacement

The Flynsu HE300VG turbocharger offers complete replacement functionality at a significantly lower price point than the A-Premium option. At $458, this turbo provides an affordable path back to the road when your original unit has failed. The unit is designed as a direct replacement for the 2013-2018 Dodge Ram 6.7L Cummins application.

Customer reviews reveal the trade-offs you make with budget pricing. While some users report good fitment and satisfactory performance, others have experienced early failures and quality concerns. The 3.2-star rating reflects this inconsistency, with about 38% of customers giving positive reviews but a significant minority reporting problems.

The turbo includes all the necessary components for installation and matches OE specifications for fitment. At 42.5 pounds, the weight is consistent with factory turbos, suggesting authentic construction rather than cutting corners on materials. However, the quality control issues cannot be ignored, particularly regarding bearing reliability in some units.

Performance on properly functioning units matches stock output levels. Boost comes in at the expected RPM range, and maximum boost pressure is consistent with factory specifications. EGTs remain normal, and overall drivability feels comparable to the original turbo. The issue is purely consistency from unit to unit.

Ideal Use Case

This turbo works best for budget-conscious owners with older trucks where absolute reliability is less critical. If your Ram has high mileage and you are weighing repair costs versus the truck’s value, this turbo provides an economical path forward. It is also suitable for builders who plan to upgrade to compound turbos eventually and just need something to get running again.

Risk Assessment

The mixed reliability means you are accepting some level of risk. If the turbo fails prematurely, you will need to redo the installation work. For a daily driver that needs to be reliable, I would recommend spending more for a higher-quality option. However, for a project truck or second vehicle, the savings might justify the risk.

8. EVIL ENERGY Intercooler Piping – Performance Upgrade

The EVIL ENERGY intercooler piping kit transforms the intake side of your 6.7L Cummins by replacing the restrictive factory tubes with optimized stainless steel pipes. The single customer review reports significant performance improvements, and the construction quality is immediately apparent when handling the components. This is an essential supporting modification for any serious turbo upgrade.

The kit includes both hot and cold side pipes with optimized bends and diameters that improve airflow over stock. The 4-layer high-temperature silicone boots and spring-loaded clamps ensure leak-free operation even under extreme boost pressures. At 12.85 pounds, the piping feels substantial and well-built.

Installation takes approximately 4 hours according to customer feedback, which is reasonable for a complete piping replacement. The bolt-on design requires no fabrication or modification to your truck. The optimized routing improves turbo spool by reducing restrictions in the intake path, which is particularly noticeable when running increased boost levels.

Performance Benefits

Upgraded intercooler piping provides measurable gains even on stock turbos. The smoother bends and larger diameter reduce pressure drop, allowing your turbo to work more efficiently. You will notice faster turbo spool, improved throttle response, and slightly lower intake air temperatures. These benefits compound when combined with larger turbos or compound setups.

Supporting Modification Value

Whether you are building a compound turbo kit or just want to maximize your stock turbo’s potential, upgraded intercooler piping delivers excellent value. The factory plastic and rubber tubes can swell and burst under high boost. This stainless steel kit eliminates that failure point while improving performance. It is particularly valuable for towing applications where consistent boost pressure is critical.

9. CCNLHZM Turbo Actuator – Reliable VGT Replacement

The CCNLHZM turbo actuator rounds out our VGT actuator options with a balance of features and pricing. The aluminum construction provides durability and heat resistance, while the included calibration module makes setup straightforward. At $248.99, this unit sits in the middle of the price spectrum for VGT replacements.

Customer feedback indicates noticeable performance improvements when the unit works properly. Throttle response improves, turbo lag decreases, and overall engine smoothness enhances. The actuator properly controls VGT vanes throughout the RPM range, maintaining optimal boost delivery. However, like some other budget options, reliability consistency varies between units.

The 12-month warranty provides basic coverage, though not as comprehensive as the 10-year warranty offered by our top pick. The complete package includes actuator, adapter harness, calibration module, gaskets, screws, and ties. Everything needed for installation is in the box, which is always appreciated.

Installation Notes

Installation follows the standard VGT actuator procedure. The calibration module is straightforward to use, though 2018+ model owners should budget for an additional security bypass OBD2 cable. Plan for about 2 hours if you are experienced, longer if this is your first time working on the turbo system.

Reliability Considerations

The mixed reviews suggest some quality control inconsistency. Some customers report long-term reliability while others experienced early failures. If you choose this option, consider keeping your old actuator as backup temporarily to ensure the new unit is functioning properly before disposing of it.

10. Mishimoto Exhaust Manifold Stud Kit – Essential Hardware

The Mishimoto exhaust manifold stud kit is one of those upgrades you do not think about until you need it, but it absolutely deserves consideration during any turbo work. These chromium-infused steel studs resist corrosion, high heat, and bolt rounding in ways that factory hardware simply cannot match. The lifetime warranty shows Mishimoto’s confidence in the product.

The 4.8-star rating from 12 customers is impressive, with 85% giving perfect 5-star reviews. The 12-point design provides excellent grip for your sockets, reducing the chance of rounding bolts during removal or installation. This becomes particularly valuable if you ever need to remove the manifold again in the future.

These studs improve boost sealing and reduce manifold warpage risk, which directly impacts turbo performance. A properly sealed exhaust manifold ensures optimal exhaust flow to your turbo, improving spool and maximum boost potential. The improved alignment also simplifies installation, especially in the tight confines of the 6.7L engine bay.

Why This Matters for Turbo Work

Any time you are removing the exhaust manifold for turbo work, upgrading to quality studs is cheap insurance against future problems. Factory bolts can corrode and seize, making future removal difficult. These studs from Mishimoto solve that problem while improving sealing. For the relatively low cost, they provide excellent insurance against future headaches.

Installation Tips

Installation is straightforward but take care to properly torque each stud in sequence. Using anti-seize on the threads is recommended for future serviceability. The studs are clearly marked and fit perfectly in the Cummins exhaust manifold. Plan an extra 30 minutes to an hour for your turbo job to account for stud installation.

Buying Guide: How To Choose the Best Compound Turbo Kits for 6.7L Cummins Engines?

When selecting compound turbo kits for 6.7L Cummins engines, understanding your specific use case is critical. Daily drivers who tow heavy loads need different characteristics than drag trucks focused on maximum dyno numbers. The compound turbo market offers solutions across this spectrum, but matching the right setup to your needs requires careful consideration.

VGT Actuator vs Complete Turbo Replacement

Start by diagnosing your actual issue. If your turbo is functioning but showing symptoms like reduced power, check engine lights for VGT codes, or poor throttle response, replacing just the actuator may solve your problem for a fraction of the cost. VGT actuators control the variable geometry vanes that optimize boost across the RPM range, and they are a common failure point on 6.7L Cummins engines.

However, if you have physical turbo damage like worn bearings, damaged compressor wheels, or cracked housings, complete turbo replacement becomes necessary. A failing turbo can send metal debris into your engine, causing catastrophic damage. When in doubt, a professional inspection can determine whether actuator replacement will suffice or if you need a complete turbo.

Compound Turbo Systems Explained

True compound turbo systems use two turbos working in series. A smaller high-pressure turbo spools quickly for low-RPM response, while a larger atmospheric turbo handles high-RPM airflow. This combination delivers the best of both worlds: instant throttle response like a small turbo with the high-flow capacity of a large turbo. Most street-driven compound kits use your stock VGT as the atmospheric turbo, adding an S300 or similar as the high-pressure unit.

The benefits include 250-400F lower EGTs under load, improved fuel economy from more efficient combustion, and power potential from 500 to 1000+ HP depending on fuel system upgrades. The trade-offs include added complexity, more maintenance points, and higher initial cost. However, for serious towing or performance builds, compounds deliver unmatched performance.

Installation Considerations

Installation complexity varies dramatically between options. VGT actuator replacement takes 1-2 hours for experienced DIY mechanics. Complete turbo replacement typically requires 4-8 hours. Full compound turbo systems can take 10-30 hours depending on the kit and your mechanical ability. Consider whether you have the tools, time, and skill for the job, or budget for professional installation.

Supporting modifications often become necessary at higher power levels. Head studs, lifted pump, larger injectors, and built transmission all factor into the total cost. Plan your build as a complete system rather than adding pieces piecemeal. This approach ensures each component works properly with the others and prevents expensive mistakes.

Tuning Requirements

Any significant turbo upgrade requires custom tuning to function properly and safely. Stock tuning cannot support compound turbos or even significantly larger single turbos. Popular tuners for 6.7L Cummins include EFI Live, MM3, and HP Tuners. Working with an experienced diesel tuner who understands compound setups is critical. Poor tuning can destroy your engine quickly, while good tuning unlocks the full potential of your investment.

Tuning needs vary by application. Towing tunes focus on EGT control and torque management. Race tunes prioritize maximum power. Daily driver tunes strike a balance between responsiveness and reliability. Be honest with your tuner about your truck’s use so they can tailor the calibration appropriately.

Emissions Considerations

This is a complex area that varies by location and intended use. Removing emissions equipment is illegal for street use in the United States. Some compound turbo kits retain factory emissions equipment, making them legal for street use. Others require deletion of emissions components, limiting them to off-road use only. Research your local laws carefully before making modifications that could affect your truck’s street legality.

For 2013-2018 trucks, the emissions system includes DEF, DPF, and EGR. Some compound kits integrate with these systems, while others require removal. Work with reputable manufacturers who clearly state emissions compliance. Off-road-only trucks used for racing or competition have different requirements than daily drivers used on public roads.

Frequently Asked Questions

Conclusion

Choosing the right compound turbo kits for 6.7L Cummins engines requires balancing your performance goals, budget, and intended use. For most owners dealing with VGT actuator issues, the WOLLAHS Turbo Actuator offers the best combination of quality, warranty, and value. Those needing supporting components will appreciate the Fleece Performance drain tube kit for its problem-solving design and the Mishimoto manifold stud kit for its lifetime durability.

Remember that turbo upgrades are part of a complete system. Proper tuning, supporting modifications, and quality installation work are just as important as the hardware itself. Whether you are building a 1000 HP drag truck or a reliable tow rig that pulls heavy loads daily, the products in this guide provide proven solutions used by thousands of Cummins enthusiasts.

Invest in quality components from reputable manufacturers, work with experienced tuners, and do not cut corners on installation. Your 6.7L Cummins is capable of impressive power and reliability when built correctly. Take your time, plan your build carefully, and enjoy the transformation of your truck’s performance.