The secret to a successful engine conversion lies in the quality of your connections. Cheap fittings leak oil and coolant, turning a minor oversight into a major headache on the side of the road.
Selecting the Best 2nd Gen Swap Kit 6.7 Cumminses requires an eye for build materials and exact fitment specs. Investing in hardware that survives the heat is your best insurance against a ruined weekend.
Key Takeaways
- Prioritize stainless steel braided lines to prevent heat degradation in high-temperature engine bays.
- Verify that your drain kit includes aluminum 10AN adapters for a secure, leak-free connection to the oil pan.
- Check if your chosen intake package includes a redesigned grid heater to maximize airflow efficiency.
- Ensure coolant bypass kits use high-grade hoses rated for extreme pressure cycles.
- Always match your turbo drain orientation to the specific model of S300 or S400 charger you installed.
| Essential Swap Foundation |  |
Generic Stainless Steel Turbo Drain | Durable braided stainless steel | Includes necessary hardware | Flexible routing | View on Amazon | Read Review |
| Precision Fit Component |  |
2nd Gen Swap Turbo Drain | Specific for swap geometry | Compatible with many years | Reliable seal | View on Amazon | Read Review |
| Maximum Airflow Upgrade |  |
Banks Power Monster-Ram Intake | Significant airflow increase | Removes grid heater restriction | Improved throttle response | View on Amazon | Read Review |
| High Flow Alternative |  |
Banks Power Monster-Ram Upgrade | High volume intake | Eliminates grid heater blockages | Clean engine bay look | View on Amazon | Read Review |
| Performance Turbo Essential |  |
S300 S400 Turbo Drain Kit | S300 and S400 ready | Robust 10AN adapters | Heat resistant materials | View on Amazon | Read Review |
| Professional Grade Plumbing |  |
Fleece Performance Turbo Drain | High quality fittings | VGT swap compatible | Consistent oil flow | View on Amazon | Read Review |
| Essential Maintenance Upgrade |  |
Cummins Crankcase Filter Kit | Improves crankcase venting | Solid mounting hardware | Direct replacement fit | View on Amazon | Read Review |
| Leak Prevention Solution |  |
Coolant Fitting Upgrade Kit | Eliminates quick disconnect failures | Reliable 10AN conversion | Secure elbow fitting | View on Amazon | Read Review |
| Engine Thermal Protection |  |
Fleece Performance Coolant Bypass | Manages cylinder pressure | Prevents thermal stress | Clean mounting layout | View on Amazon | Read Review |
| Complete Swap Hardware |  |
Fleece VGT Turbo Install Kit | Includes all gaskets | Complete hardware set | Professional black finish | View on Amazon | Read Review |
More Details on Our Top Picks
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Generic Stainless Steel Turbo Drain
This kit is your go-to solution if you prioritize reliability and fitment during a turbo upgrade. The stainless steel braided line offers the flexibility required to route oil correctly without kinks, which acts like a flexible artery for your turbocharger.
It is best for those who want a straightforward, no-nonsense installation. The included connectors and screws save you a trip to the hardware store. Just ensure your turbo orientation aligns with the hose length before final tightening.
- Part Category:Turbo Drain
- Engine Compatibility:6.7L Cummins
- Material Type:Stainless Steel
- Additional Feature:Braided oil feed line
- Additional Feature:Direct fit components
- Additional Feature:High pressure connectors
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2nd Gen Swap Turbo Drain
If you are moving to a 2nd Gen style turbo, this drain kit addresses the specific geometry changes that usually cause headaches. It handles the oil return path efficiently, preventing pressure buildup. Think of it as the perfect bridge between your engine block and the new turbo.
It is built for 2003 through 2018 models, making it highly versatile for various project years. Watch the clamp tension during installation to prevent potential leaks.
- Part Category:Turbo Drain
- Engine Compatibility:5.9L and 6.7L Cummins
- Material Type:Metal
- Additional Feature:High temperature seals
- Additional Feature:Optimized drain angle
- Additional Feature:Secure clamp set
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Banks Power Monster-Ram Intake
This intake is for the owner who demands peak engine breathing. By replacing the restrictive factory unit, you allow the engine to ingest air without the typical bottlenecks. It functions like an open highway for intake pressure.
The kit also deletes the troublesome grid heater, which removes a common failure point. Be prepared for a more involved installation process compared to a simple hose swap.
- Brand Name:Banks Power
- Part Category:Intake Manifold
- Engine Compatibility:6.7L Cummins
- Additional Feature:Monster-Ram housing
- Additional Feature:Grid heater delete
- Additional Feature:Optimized flow path
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Banks Power Monster-Ram Upgrade
This specific version of the Monster-Ram provides the same performance gains as its counterpart but often features subtle casting variations for different production windows. It is the best choice if you want to eliminate the cluttered factory intake entirely.
It works effectively for those pushing higher boost levels. You will notice quicker turbo spooling immediately after the installation.
- Brand Name:Banks Power
- Part Category:Intake Manifold
- Engine Compatibility:6.7L Cummins
- Additional Feature:Cast aluminum construction
- Additional Feature:Improved port geometry
- Additional Feature:Performance hardware included
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S300 S400 Turbo Drain Kit
Designed specifically for the popular S300 and S400 turbo frames, this kit uses 10AN adapters to ensure a leak-free oil return. The stainless braiding provides the tough exterior needed to withstand intense engine bay heat.
This is the right choice for serious builds where you cannot afford an oil leak. The aluminum fittings keep the weight down while maintaining a high safety margin.
- Part Category:Turbo Drain
- Engine Compatibility:5.9L and 6.7L Cummins
- Material Type:Aluminum and Stainless
- Fitting Size:10AN
- Additional Feature:Braided steel hose
- Additional Feature:Secure aluminum adapters
- Additional Feature:High flow design
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Fleece Performance Turbo Drain
Fleece Performance is known for consistent quality, and this drain kit follows that trend. It provides an exact path for oil return on VGT swap setups. It acts as the spinal cord for your turbo oiling system, ensuring stability under load.
The fit and finish are exceptional, making it a favorite for those who value longevity. It is slightly more rigid than generic kits, so plan your routing carefully.
- Brand Name:Fleece Performance
- Part Category:Turbo Drain
- Engine Compatibility:6.7L Cummins
- Additional Feature:Engineered for VGT swaps
- Additional Feature:Leak resistant seals
- Additional Feature:Precision machined ends
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Cummins Crankcase Filter Kit
If you are performing a swap, do not overlook your crankcase ventilation. This kit replaces the factory filter housing with a more reliable setup, preventing pressure buildup in the crankcase. It is a necessary safety measure for any high performance engine.
The included brackets and clamps make for a firm, vibration-free mounting point. It is straightforward enough for a weekend garage project.
- Part Category:Crankcase Filter
- Engine Compatibility:6.7L Cummins
- Additional Feature:Includes mounting bracket
- Additional Feature:Secure hose clamps
- Additional Feature:Optimized filter element
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Coolant Fitting Upgrade Kit
Factory quick-disconnect fittings are notorious for failing under pressure. This kit converts those weak points to a reliable 10AN connection, effectively curing a common coolant leak source. It is a smart proactive upgrade.
You will appreciate the simplicity of the elbow fitting. Just double-check your coolant levels after the swap to ensure you have purged all the air.
- Part Category:Cooling System
- Engine Compatibility:6.7L Cummins
- Fitting Size:10AN
- Additional Feature:High pressure adapter
- Additional Feature:Quick disconnect delete
- Additional Feature:Durable hose clamp
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Fleece Performance Coolant Bypass
This bypass kit is vital for protecting your engine from excessive cylinder pressure and thermal stress. It allows coolant to flow even when the thermostat is closed, which acts like a safety valve during hard pulls. It is a must-have for long-term engine health.
Fleece designs these to mount cleanly, keeping your engine bay organized. Expect a more consistent temperature profile while towing or racing.
- Brand Name:Fleece Performance
- Part Category:Cooling System
- Engine Compatibility:6.7L Cummins
- Additional Feature:Optimized coolant flow
- Additional Feature:Durable bypass valve
- Additional Feature:Easy installation process
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Fleece VGT Turbo Install Kit
When you commit to a VGT swap, chasing down individual gaskets and bolts is a nightmare. This kit pulls everything into one organized package, saving you the frustration of missing a single O-ring. It is the complete puzzle solution for your turbo upgrade.
The black finish looks clean and professional under the hood. It is a high-value kit for anyone starting their swap from scratch.
- Brand Name:Fleece Performance
- Part Category:Turbo Installation
- Engine Compatibility:6.7L Cummins
- Additional Feature:All required seals
- Additional Feature:High grade bolts
- Additional Feature:Simplified installation sequence
Frequently Asked Questions
Will a second gen swap improve my fuel economy?
It might, but do not expect a miracle. By improving exhaust gas flow and reducing backpressure, your engine operates more efficiently under load. Most drivers see a slight improvement when towing, but your driving habits still dictate your final mileage numbers.
Do I need a custom tune after installing this kit?
Yes, you absolutely need a retune. Moving the turbo and changing the air intake path alters how the engine breathes. Without a custom calibration, your truck will likely run rich or experience dangerous boost spikes that could damage your motor.
How much fabrication is required for the install?
Most reputable kits are bolt-on, but expect to do some minor work. You will likely need to adjust your cold air intake plumbing and potentially trim some plastic components in the engine bay. It is rarely a simple "drop-in" job, so plan for a full weekend of work in the garage.
Can I still use my stock exhaust system?
Not without modifications. Because the turbo is now located further forward, your existing downpipe will not reach the new outlet. You will need a conversion downpipe that connects the new turbo position to your existing exhaust piping.
Does this swap increase turbo lag compared to the stock setup?
It depends on the size of the turbo you select. A larger turbo will naturally take longer to spool, but the 2nd gen manifold design is much more efficient than the restrictive factory unit. If you choose a properly sized charger for your injectors, the difference in spool time is often negligible.
