Premium DPF Delete Race Pipe: 4"/5" Cat&Downpipe-Back for 2011-2015 LML 6.6L Duramax
Unlock your 2011-2015 LML Cummins's true potential with this high-performance DPF delete pipe. Our precision-engineered solution eliminates restrictive factory filters, dramatically reducing exhaust gas temperatures (EGTs) while improving turbo spool-up and throttle response. The mandrel-bent construction ensures maximum flow efficiency, helping your diesel breathe easier. Perfect for off-road enthusiasts seeking better power delivery and reduced maintenance hassles.
Specification
| Exhaust Material |
T-409 Stainless Steel, it is magnetic. |
| Thickness |
2mm thick for long-lasting durability and heat resistance. |
| Inlet Diameter |
4.0"/5.0‘’ |
| mandrel-bent construction |
Maximum flow efficiency, helping your diesel breathe easier |
Benefits
Expect to see a significant increase in fuel mileage. If your DPF is plugged up your probably averaging about 13-14 mpg. More or less depending on the severity of the restriction. After deleting the DPF/CAT expect to get a combined mileage of 18-19 mpg.
- It removes the need to service the DPF at regular intervals (cleaning, replacement)
- A DPF delete will remove the possibility of a DPF failure which could cause expensive diesel repairs
- Due to less exhaust backpressure, the DPF delete increases exhaust flow and therefore increases the performance of your motor!
- Paired with an ECU remap, the DPF delete is proven to increase power and torque for all vehicles
Installation
Install takes about 1hr with basic hand tools done on the ground of your driveway or garage. Quicker if you have automotive style lift. Cutting may be be required to fit shorter wheelbase bed/cab configurations. Clamps, hangers and hardware are included. You may have to re-use some factory hardware.
Tuner Required: Removal of the DPF, CAT, SCR, and/or DOC involves removing and eliminating emission related sensors. A DPF delete capable tuner is required to prevent any check engine light or diagnostic trouble codes from setting.
Fitment
2011-2015 Chevy / GMC Duramax Diesel LML. Silverado and Sierra pickup trucks.
2015 or 2015.5?
2015 is a split year. The 2011-2015 downpipe is secured to the turbo-direct pipe using a V-band style clamp. The 2015.5-2016 uses a 3 bolt flange style connection. Be sure to visually verify the clamp style your truck is equipped with.
Q1: What’s the difference between 4-inch and 5-inch exhaust systems for diesel trucks?
A:
- 4-inch: Ideal for mild to moderately tuned diesel engines. Retains optimal backpressure to boost low-end torque, perfect for daily driving and light towing needs.
- 5-inch: Best for high-horsepower performance builds. Maximizes exhaust flow to lower exhaust gas temperature (EGT) and unlock peak power for racing or heavy-duty applications.
Q2: Can a magnet stick to this exhaust pipe? Is it genuine stainless steel?
A: Yes. This pipe is crafted from T-409 stainless steel—a magnetic alloy specifically engineered for automotive exhaust systems (unlike non-magnetic T-304). It delivers superior corrosion resistance, high-temperature durability, and better cost-effectiveness than alternative materials.
Q3: How thick is the exhaust pipe, and what’s its service life?
A: The pipe features a 2mm thick wall made of T-409 stainless steel. It’s built to be durable, moderately weighted, and long-lasting, withstanding off-road vibrations and extreme exhaust heat for years of reliable use.
Q4: Is this a full turbo-back exhaust system or just a header pipe?
A: This is a downpipe-back system—it replaces all exhaust components after the downpipe, including the restrictive DPF and stock exhaust pipes. For a complete turbo-back exhaust setup, you will need an additional DPF-delete race pipe.
Q5: Will this DPF delete kit boost my diesel truck’s performance?
A: Yes! The core performance benefits include:
- Reduced exhaust gas temperature (EGT) to protect engine components
- Faster turbocharger spool and throttle response
- Improved fuel efficiency (when paired with proper ECU tuning)
- Permanent elimination of DPF clogging and regeneration issues
Q6: I have a 2015 diesel truck, which has fitment differences due to model-year updates. How do I choose the right kit?
A: Focus on your truck’s exhaust downpipe connection type, the key difference between early and late 2015 models:
- 2011–2015 models: Exhaust downpipe attaches to the turbocharger straight pipe via a V-band clamp
- 2015.5–2016 models: Exhaust downpipe uses a three-bolt flange connectionSelect the kit that matches your truck’s specific connection design for a perfect fit.
Q7: Is this exhaust pipe compatible with my LML Duramax if I upgrade to a 5-inch exhaust system?
A: Yes! This exhaust pipe is fully compatible with both 4-inch and 5-inch LML Duramax exhaust systems. It’s a top choice for anyone looking to upgrade their 2015 LML Duramax, 2016 Duramax, or 5-inch Duramax exhaust setup to maximize exhaust flow and performance.
Q8: Can I legally drive my truck with this DPF delete kit on public roads in the US?
A: Off-road/racing use only. Removing the Diesel Particulate Filter (DPF) violates U.S. EPA (Environmental Protection Agency) and CARB (California Air Resources Board) emissions regulations. Use on public roads may result in fines, emissions test failures, and legal penalties. Always check local state laws before installation.
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