Adding more air to a diesel engine actually lowers exhaust gas temperatures when done right. Stacking two chargers together transforms a heavy-duty pickup into an absolute powerhouse.
Finding the Best Compound Turbo Setups for 6.7 Cummins requires looking closely at plumbing, drainage, and factory hardware limits. Getting this combination right changes everything.
Read on to see the essential components required for a reliable twin setup.
Key Takeaways
- Prioritize complete plumbing kits that account for factory air conditioning lines to prevent clearance headaches during installation.
- Verify that oil drain tubes feature flexible or high-temperature braided lines to handle extreme heat cycles without leaking.
- Match rebuild components precisely to electronic actuator models like the HE300VG to ensure proper wastegate control and boost management.
- Check that all adapter flanges and brackets use heavy-gauge steel or aluminum to support the immense weight of dual turbos.
- Invest in complete hardware bundles that include fresh gaskets and clamps to avoid unexpected delays during assembly.
| Essential Clearance Fix |  |
Diesel Power Source A/C Line Relocation Kit | Prevents component rubbing | Includes necessary fittings | Clears compound piping | View on Amazon | Read Review |
| Smooth Oil Return |  |
Cummins Turbo Drain Tube Kit | Prevents oil pooling | Fits common frame sizes | Heavy duty construction | View on Amazon | Read Review |
| Cost Effective Rebuild |  |
Cummins ISB HE300VG Turbo Repair Kit | Restores boost performance | Replaces wearable components | Saves replacement costs | View on Amazon | Read Review |
More Details on Our Top Picks
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Diesel Power Source A/C Line Relocation Kit
If you are planning a massive compound setup on your 2010 through 2018 Dodge Ram, you will quickly discover that factory air conditioning lines sit squarely in the path of your new piping. Diesel Power Source designed this specific routing package to solve that exact headache without requiring you to completely abandon your cab's cooling comfort.
The primary advantage here is preventing costly custom fabrication when you install secondary chargers under the hood. You get a much cleaner routing path that keeps hoses away from searing hot exhaust housings.
One minor limitation involves the installation process itself, which demands patience because you are working in a tight engine bay. Expect to drain your refrigerant system and spend a solid afternoon carefully routing the new lines.
- Brand:Diesel Power Source
- Compatibility:2010-2018 Dodge Ram 2500/3500
- Application:A/C line relocation
- Kit Type:Relocation bracket and lines
- Engine Series:6.7L Cummins
- Additional Feature:Relocates factory A/C lines
- Additional Feature:Designed for compound setups
- Additional Feature:Prevents heat damage
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Cummins Turbo Drain Tube Kit
Upgrading to a twin turbo configuration means your secondary low-pressure charger sits lower in the engine bay, which throws off the gravity drain for your engine oil. This specific drain tube setup ensures that oil flows downward freely from your S300 and S400 series units straight back into the engine block without pooling in the center housing.
Proper oil scavenging prevents smoke, leaks, and eventual bearing failure on expensive aftermarket chargers. You will appreciate the sturdy construction that handles high under-hood temperatures without weeping oil at the connections.
The tricky part of this installation is accessing the factory oil pan port on the side of the block. You will need nimble hands and standard shop tools to secure the lower flange properly.
- Compatibility:S300 and S400 Turbos
- Application:Turbo oil drain
- Kit Type:Drain tube kit
- Engine Series:6.7 Cummins
- Additional Feature:Direct oil return path
- Additional Feature:High temperature hose
- Additional Feature:Secure flange connections
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Cummins ISB HE300VG Turbo Repair Kit
When your variable geometry stock charger starts showing signs of shaft play or smoking, buying a brand new unit is not your only financial option. This rebuild package provides the internal wearable components needed to restore your factory HE300VG turbocharger back to factory specifications.
Precision bearings and seals inside the box help eliminate radial play and restore proper boost response to your daily driver. Tackling this project yourself saves a significant chunk of change compared to a complete assembly replacement.
Keep in mind that rebuilding a VGT unit requires specialized knowledge, especially when dealing with the electronic actuator and nozzle ring assembly. You also need access to a dynamic balancing machine if you replace the turbine wheel to avoid catastrophic vibrations.
- Compatibility:Cummins ISB 6.7L HE300VG
- Application:Turbocharger repair
- Kit Type:Rebuild kit
- Engine Series:6.7L ISB
- Additional Feature:Includes journal bearings
- Additional Feature:High grade piston rings
- Additional Feature:Rebuilds HE300VG chargers