Most people think building serious horsepower on a heavy-duty diesel requires replacing the entire engine block. But that assumption ignores the true air-management bottleneck sitting right under the hood.
Managing immense boost pressures demands precision hardware rather than just raw fuel volume. Selecting the Best Compound Turbo Setups for 6.7 Cummins requires looking closely at plumbing, drainage, and support components.
Let us break down the exact parts that keep high-pressure systems running reliably. Keep reading to see the essential hardware upgrades for your truck.
Key Takeaways
- Prioritize kits that include braided stainless steel lines to resist extreme under-hood temperatures and high-pressure wear.
- Verify exact model-year compatibility because Dodge made subtle clearance changes across the 2010 through 2018 production runs.
- Inspect the bearing housing and journal specifications carefully to ensure the rebuild components match factory tolerances.
- Look for complete mounting hardware packages that save you from hunting down specialty metric bolts during the installation process.
- Confirm that oil drain tubes feature expanded inner diameters to prevent dangerous pressure backups in secondary chargers.
| Essential Clearance Fix |  |
Diesel Power Source A/C Line Relocation Kit | Prevents line damage | Model specific fit | Clears secondary turbos | View on Amazon | Read Review |
| Reliable Oil Return |  |
Cummins Turbo Drain Tube Kit | Handles high oil temperatures | Fits S300 and S400 | Prevents oil leaks | View on Amazon | Read Review |
| Complete Rebuild Solution |  |
Cummins ISB 6.7L Turbo Repair Kit | Includes essential internal seals | Restores turbo efficiency | Targets HE300VG units | View on Amazon | Read Review |
More Details on Our Top Picks
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Diesel Power Source A/C Line Relocation Kit
When you start building a compound setup under the hood of your 6.7 Cummins, you quickly realize that the factory air conditioning lines sit right in the path of the secondary atmospheric turbocharger. This hardware package shifts those factory lines safely out of the way so you can complete your installation without crushing aluminum tubing or melting rubber hoses against scorching exhaust housings. It is built specifically for 2010 through 2018 Dodge Ram 2500 and 3500 trucks.
The primary strength here is simple prevention because forcing stock lines to bend around a massive S400 charger is a recipe for a refrigerant leak on a hot summer afternoon. You get a direct, purpose-built fit that eliminates the guesswork of custom fabricating your own brackets. But the main limitation is that you still have to properly recover and recharge your vehicle's air conditioning system during the process, which adds an extra step to your garage project.
- Brand:Diesel Power Source
- Application:2010-2018 Dodge Ram 2500/3500
- Component Type:A/C Line Relocation Kit
- Additional Feature:Relocates factory air conditioning lines
- Additional Feature:Prevents turbocharger clearance interference
- Additional Feature:Designed for heavy duty trucks
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Cummins Turbo Drain Tube Kit
Building a custom multi-charger arrangement means you need a dependable path for engine oil to escape the bottom of your secondary turbocharger and return safely to the oil pan. This drain tube kit handles that exact plumbing challenge for popular S300 and S400 turbo configurations. You want a smooth, unobstructed gravity drain unless you enjoy cleaning up burnt puddles of synthetic oil from your driveway.
The standout benefit of this plumbing assembly is that it resists the intense engine bay heat that regularly destroys cheap rubber or silicone lines over time. It gives your heavy duty setup the proper fittings required to prevent crankcase pressure issues and oil backup inside the CHRA. The only real drawback is that custom compound installations sometimes require minor tweaking of tube angles to match your exact manifold drop.
- Application:S300 and S400 Turbos
- Component Type:Turbo Drain Tube Kit
- Additional Feature:Direct oil return path
- Additional Feature:High temperature hose construction
- Additional Feature:Secure flange fittings
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Cummins ISB 6.7L Turbo Repair Kit
Every high-performance diesel engine eventually demands fresh internal wear components, and a stock variable geometry charger requires proper seals and bearings to hold up against boost pressure. This comprehensive rebuild package targets the HE300VG turbocharger found on the 6.7L Cummins ISB engine. You will find all the crucial hardware needed to refresh a tired turbo before you push it to higher output levels.
The biggest advantage is the sheer completeness of the kit, supplying everything from heavy-duty journal bearings to precise piston ring seals that stop oil from blowing past the turbine wheel. It saves you from buying individual OEM pieces separately at steep dealership parts counters. The catch is that rebuilding a VGT turbocharger requires precise balancing equipment and patience, meaning it is not a casual weekend project for an absolute beginner.
- Application:Cummins ISB 6.7L Engine
- Component Type:Turbo Repair Rebuild Kit
- Compatibility:HE300VG Turbocharger 3771710 3771664 3771669 3771713
- Additional Feature:Rebuilds factory VGT turbochargers
- Additional Feature:Includes high grade journal bearings
- Additional Feature:Restores proper boost control
