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TruckTok 2011-2015 Chevy/GMC Duramax LML 4" DPF & CAT Delete Pipe (with Muffler)
Brand TruckTok

TruckTok 2011-2015 Chevy/GMC Duramax LML 4" DPF & CAT Delete Pipe (with Muffler)

SKU DP-0275
$374.90 - $374.90
$374.90
$374.90 - $374.90
$374.90

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Availability:
in stock, ready to be shipped

Installation Discussion & Community Support

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FITMENT

  • 2011-2015.5 6.6L Silverado & Sierra Duramax 2500HD/3500HD LML engine with a V-Band Clamp.
  • Does NOT Fit 2015.5-2016 models equipped with the 3-bolt flange. Please check underneath your truck!
  • Please physically inspect underneath your truck to verify your turbo discharge style before purchasing!

DESCRIPTION

Product Overview

  • The 11-15.5 6.6L Duramax LML is an incredible workhorse, but it is notorious for being heavily strangled by its complex first-generation DEF/SCR and DPF/CAT emissions systems. As these trucks age, the factory DPF ceramic core plugs up permanently with non-burnable ash.
  • This results in your truck entering endless Active Regeneration cycles, which forcefully dumps raw diesel into the exhaust stroke just to heat up the filter.
  • Your fuel economy tanks to a miserable 13-14 MPG, your EGTs skyrocket, and the immense backpressure puts extreme fatigue on turbocharger, frequently dropping the truck into Limp Mode.

Key Features

  • True 4" Mandrel-Bent Flow: CNC mandrel-bent 4" T-409 SS tubing ensures smooth, high-velocity exhaust flow. Completely unrestricted with No Bungs to interrupt the air path.
  • Massive Fuel Mileage Gains: Eliminates the fuel-hungry active regeneration process. Most LML owners see fuel economy recover from a clogged 13 MPG up to a clean 18-19 combined MPG on the highway.
  • Drastic EGT & Backpressure Relief: Allows hot exhaust gases to escape instantly right out of the downpipe. This reduces structural heat-soak and lowers EGTs, protecting your turbocharger under heavy towing loads.
  • Integrated Performance Muffler: Specifically engineered to deliver full backpressure relief while trapping harsh high-frequency exhaust notes and eliminating painful cabin drone during long highway towing hauls.

FAQ

Q: What is the difference between this 11-15.5 and 15.5-16?

A: The turbo downpipe outlet flange changed midway through 2015. This pipe fits the early 11–15.5 V-band style clamp, while our 15.5–16 pipe fits the late-generation 3-bolt flange. Under-truck exhaust routing and hanger locations are otherwise identical.

Q: Do I still need a performance tuner with this kit?

A: Yes, absolutely. Removing the catalytic converter and DPF changes the pressure readings monitored by the ECM. You MUST run a delete-capable programmer (like Mini Maxx tuner) to turn off emissions tracking, stop DPF regeneration cycles, and prevent the truck from entering Limp Mode.

Q: How much will this kit improve my LML's fuel economy (MPG)?

A: Most owners see a massive jump. While a clogged factory DPF drops fuel economy to 13–14 MPG due to frequent regenerations, this pipe and a proper tune can restore combined mileage to 18–19 MPG under normal driving conditions.

Q: Why do I need an EGR Delete and CCV Reroute along with this exhaust setup?

A: To stop tar-like sludge from choking your intake. This pipe fixes your exhaust, but your intake still faces oily CCV mist and abrasive EGR soot that block airflow and spike EGTs. Pairing this upgrade with an LML EGR Delete and CCV Reroute stops sludge build-up and prevents coolant leaks, ensuring 100% clean airflow.

  • 5 stars: 14 (82%)
  • 4 stars: 3 (18%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
This product has no reviews of its own. The merchant grouped it with related products, so the reviews shown are from across that group.
J
Jesse Colton
2013 Sierra — runs better than new

2013 GMC Sierra 2500 with 140K miles. Was dealing with constant regens and EGR soot buildup. Bought this combo kit and a tune. Whole install took a Saturday afternoon. Truck now pulls harder, runs cooler EGTs, and I'm seeing 3-4 mpg improvement on the highway. Should have done this years ago.

R
Roy Whitaker
LML owners — this fixes the CP4 issue indirectly

The biggest threat to the CP4 pump is soot-contaminated oil from the EGR system. Removing the EGR keeps your oil cleaner which means your CP4 injection pump lives longer. This kit literally pays for itself by helping prevent a $4000 injection pump failure.

N
Nate Colby
Make sure you have a tuner ready

The kit itself is 5-star quality. Just want to emphasize what others have said: you CANNOT drive the truck after installing without flashing the ECM first. It will go into limp mode immediately. Have your tuner (EFI Live, EZ Lynk, HP Tuners) ready before you turn a wrench.

O
Owen Stark
Coolant line plugs worked perfectly

The EGR delete section comes with proper plugs for the coolant lines that fed the EGR cooler. Threaded brass plugs with O-rings — not the rubber caps some kits use. Zero coolant leaks. This attention to detail in the small parts is what separates this kit from cheaper alternatives.

L
Levi Parsons
Good kit but instructions could be clearer

Everything fits great and the quality is there. Took off one star because the instructions are a single sheet with small photos. If you haven't done an EGR delete before, budget extra time for YouTube research. The DPF pipe part is simple. The EGR section takes some patience finding all the coolant lines.

D
Dan Shipley
Saved over $200 buying as a combo

Priced out DPF pipe and EGR delete separately from other brands — would have been over $400. This combo kit was way more affordable and the quality is identical to the name brands. Everything fit without modification on my 2012 Silverado 3500.

R
Reed Callahan
2015 LML with 180K — still running strong

Had this kit installed at 120K miles. Now at 180K and the truck has never run better. Oil analysis shows way less soot contamination since the EGR was removed. UOAs went from 'caution' to 'normal.' If you plan to keep your LML long term, this is maintenance, not just performance.

G
Grant Holloway
EGR plates are thick — no leaks

I was worried about the EGR block-off plates being thin and warping under heat. These are 1/4-inch steel plates with proper gaskets. Torqued to spec and zero exhaust leaks after 6 months. The DPF pipe is 304 stainless with clean welds. Solid kit all around.

E
Edwin molina (United States)

TruckTok 2011-2016 6.6L Duramax LML 4"/5" DP-Back DPF/EGR Delete kit

B
Brett Hanson
Turbo spools noticeably faster

After removing the DPF brick and the EGR restriction, that VVT turbo wakes up. Spool time cut in half. Throttle response is crisp off the line. The engine bay is also way cleaner without the EGR plumbing — there's actually room to work on things now.

P
Perfection Automotive (United States)

TruckTok 2011-2015 6.6L Chevy Duramax Diesel 4inch DPF Delete Pipe Exhaust

J
Jake Bonner (United States)
Great service

Good parts

T
Troy Benson
Complete delete kit — everything you need

If you own an LML Duramax you know the DPF and EGR are the weak links. This kit has both the 4-inch race pipe and the full EGR delete. One box, one install session. Pipe bolted up perfectly to the factory downpipe. EGR plates and block-off kit fit tight. Do yourself a favor and do both at once.

T
Trevor Wilson (United States)

TruckTok 2011-2015 6.6L Chevy GMC Duramax 4" DPF Delete Pipe & EGR Delete Kit

E
Erik Garvin (United States)
Delete pipe install

This could’ve not gone any easier, I purchased this product and once I received it , it only took 3 hours to install and most the time was in removing the dpf tank and all the other junk. I highly recommend this exhaust pipe delete kit.

C
Corey Yergeau (United States)

Fits perfectly

M
Montraig Gipson (United States)
Responsive fast acting.

Pretty nice. Got recommended to you guys.. thanks again can't wait to get mines.