4"/5" DPF Delete Race Pipe for 2011-2016 LML 6.6L Duramax Chevy GMC

4"/5" DPF Delete Pipe Kit for 2011-2016 LML 6.6 Duramax 

This 4"/5" DPF delete pipe kit is crafted for those serious about getting the most out of their 2011-2016 LML 6.6 Duramax Chevy GMC. By eliminating the DPF, your exhaust system will have less backpressure, and your truck will have better fuel efficiency. For off-road and race use only.

LML DPF Delete Pipe Key Features

Two Diameter Options for Your Needs: Available in 4" and 5" sizes – the 4" offers balanced power for daily driving, while the 5" maximizes airflow for higher performance and heavy towing.

5" Inlet for Maximum Towing Power: The larger 5" diameter inlet delivers superior airflow, reducing EGTs and improving turbo response – an ideal choice for demanding towing applications.

Durable T-409 Stainless Steel Build: Constructed from T-409 stainless steel, known for excellent durability and corrosion resistance. This magnetic material stands up to heat and harsh conditions.

Complete Kit with All Hardware: Includes every component needed for a full installation – clamps, hangers, and mounting hardware – so you have everything right out of the box.

What is DPF & Benefits of Removing it

The Diesel Particulate Filter (DPF) is an emissions control device built into the exhaust system of diesel-powered vehicles. Its primary function is to trap and remove harmful soot (particulate matter) from the exhaust gas before it can be expelled into the atmosphere.

Over time, soot accumulates on the filter and causes performance problems like increased backpressure and less airflow. Removing the DPF boosts fuel flow, increases fuel efficiency, and delivers more power & torque.

How to Choose an LML DPF Delete Pipe?

4'' vs 5'' Straight Pipe Comparison

• 4-inch Straight Pipe: Produces a tighter, raspier exhaust note—especially noticeable at lower RPMs. Ideal for daily driving or mildly tuned trucks where excessive drone is undesirable.
• 5-inch Straight Pipe: Delivers a deeper, more refined tone with less high-pitch resonance. Better suited for high-output builds and towing applications, where improved exhaust flow is beneficial.

Types of DPF Delete Kits

DPF Race Delete

• Removes only the DPF (retains stock downpipe)
• Offers minimal performance gains but is the most budget-friendly
• Best for cost-conscious users or avoiding emissions testing

Downpipe-Back Delete

• Replaces the exhaust from the turbo downpipe back
• Improves mid-range power and throttle response
• Ideal for street builds using the stock turbo

Downpipe-Back Dual Exit (5" only)

• Splits into dual exhaust paths
• Enhances cooling and flow for extreme conditions
• Commonly used in heavy towing or competition setups

Muffler vs. No Muffler

With Muffler

• Reduces exhaust noise for daily driving
• Slight power restriction (~5–10 HP)
• More likely to comply with local noise regulations

Straight Pipe (No Muffler)

• Loud, aggressive exhaust tone
• Unrestricted flow for maximum horsepower
• Often not street-legal due to noise and emissions rules
• Intended for off-road or race use only

LML DPF Delete Pipe Installation Guide

Check LML 6.6L Duramax DPF Delete Kit/Exhaust System Installation Guide. All you’ll need are basic hand tools, making this an ideal DIY project. While a lift makes things easier, it’s not required. Please confirm whether your model has a V-band or 3-bolt flange connection to ensure the best fit.

Tuning is essential for ensuring optimized performance and full compatibility with the new exhaust setup. Please tune your vehicle before removing OE exhaust. Check compatible tuner: H&S PERFORMANCE Mini Maxx V1 DPF Delete Tuner | Mini Maxx V2 Tuner | EFILive AutoCal V3 DPF Delete Tuner | EZ LYNK Tune Package.

Shipping & Returns

Fast & Free Shipping Policy

Your order will be dispatched within 1-2 business days, and the package will arrive within your order's estimated date. Click for Shipping Policy.

Easy & Free Return Policy

Every order comes with a 14-day free return, which means you don't have to pay for a return slip. Click for Return Policy.

LML DPF Delete Pipe Fitment

2011-2016 Chevrolet Silverado / GMC Sierra 2500HD 3500HD with 6.6L LML Duramax diesel engine 

• 2011-2015 models use a V-band clamp to secure the downpipe to the turbo-direct pipe, 2015.5-2016 models switch to a 3-bolt flange connection for the downpipe. Make sure to double-check your truck’s clamp type before ordering to get the right fit.

LML DPF Delete Pipe FAQs

Q: What are some benefits of DPF delete?
A: Removing the DPF reduces restrictions in your exhaust system, allowing for increased power, better fuel economy, and fewer maintenance headaches.

Q: What’s the difference between DPF delete and DEF delete?
A: DEF delete removes the Diesel Exhaust Fluid system, while DPF delete removes the Diesel Particulate Filter. DPF delete directly boosts performance by cutting down exhaust restriction, so you get more noticeable gains in power and fuel economy.

Q: Do I need a tuner after DPF delete?
A: Yes, and actually beforehand. You need a tuner to tune your truck’s engine and exhaust in sync. This prevents error codes and ensures everything runs smoothly with the new system.

Q: Is the LML Duramax a good engine?
A: Known for its durability and performance, the LML Duramax is a popular choice among diesel enthusiasts. Paired with this DPF delete pipe kit, you can unlock even more of its potential for years to come.

Q: Which years of the LML Duramax should I avoid?
A: Some early 2011 models have been known to have DPF issues. With a DPF delete kit, you can bypass these problems and enjoy a more efficient exhaust system.

Q: How can I prevent CP4 fuel pump failure in the LML?
A: Using high-quality fuel and changing filters regularly helps. Removing the DPF reduces pressure on the fuel system, which can help extend the life of the CP4 pump—a known issue for this engine.

Q: What does the "DPF race pipe" mean?
A: "DPF race pipe“also called "DPF Delete Pipe", it only removes the DPF and keeps all other parts in the OE exhaust system.

Q: What does "DP-back/Downpipe-back" mean?
A: A Downpipe-back exhaust system runs from the downpipe all the way to the end of the exhaust pipe, replacing everything from the downpipe outlet back. This typically includes the mid-pipe, catalytic converter (if present), and muffler.

Q: What is your DPF made of? Stainless steel or aluminum?
A: They are made of 409 stainless steel.

Q: Do your DPF deletion kits need to purchase additional parts?
A: No, this kit comes with all the parts to complete the DPF deletion.

Q: Can your DP-back pipe work with stock parts?
A: Yes, our Dp-back pipe can fit perfectly with the stock Downpipe and stock bolts.

Q: Why do some of your DPF delete kits not work on cab and chassis models?
A: The Cab & Chassis has a relatively longer chassis and requires a tube specifically designed to fit the Cab & Chassis model. We mention Cab & Chassis in the title of our products for Cab & Chassis models, so you can check for yourself. For further assistance, you can contact our customer service.