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Trucktok 2015.5-2016 6.6L Duramax LML 4" DP-Back DPF delete Pipe & EGR/CCV Delete Kit
Brand TruckTok

Trucktok 2015.5-2016 6.6L Duramax LML 4" DP-Back DPF delete Pipe & EGR/CCV Delete Kit

SKU ER-0243
$754.35 - $754.35
$754.35
$754.35 - $754.35
$754.35

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Availability:
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Installation Discussion & Community Support

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FITMENT

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

DESCRIPTION

Product Overview

  • The factory 6.6L Duramax LML engines is designed for emissions compliance, but the DPF system can create additional exhaust restriction and increase heat management demands under heavy load. At the same time, the factory EGR system recirculates exhaust gases back into the intake system, which can contribute to soot and carbon buildup over time.
  • The LML 4" DPF Delete Pipe & EGR Delete Package combines a race pipe with EGR delete components. helps improve exhaust flow efficiency, reduce system restriction, and simplify the factory emissions configuration for off-road and competition applications where permitted.

Key Features

  • Massive Exhaust: Replaces the factory exhaust system from the DP back with smooth 4" pipe—delivering maximum exhaust flow, lowest possible EGTs, and a deep, aggressive diesel tone.
  • Reduces EGTs & Ends Active Regens: Replaces the heavy, restrictive DPF canister with a smooth 4" straight pipe to eliminate primary exhaust backpressure and stop fuel-draining regenerations.
  • Dual-Source Intake Protection: Removes EGR soot and reroutes CCV oil mist away from the engine—stopping carbon sludge buildup and keepin turbo, intercooler, and intake tract dry and claen.
  • Saves Maximum Labor & Shop Costs: Installing all three systems at once avoids duplicate teardown shop labor around the tight rear engine compartment and chassis.

FAQ

Q: What are the benefits of the 4" Downpipe back exhaust?

A: The 4" DP-ack exhaust replaces the restrictive factory emissions components to improve exhaust flow, reduce exhaust restriction, and help lower heat buildup under heavy-duty driving conditions.

Q: What is the purpose of the CCV/PCV reroute kit?

A: The CCV/PCV reroute system helps prevent oil vapor and contaminants from being introduced back into the intake system, helping maintain a cleaner intake tract.

Q: Can this kit improve towing performance?

A: By reducing exhaust restriction and improving airflow efficiency, this kit can help support better exhaust flow during towing and heavy-load driving applications.

Q: Is this kit difficult to install?

A: Installation difficulty depends on vehicle condition and experience level. Professional installation is recommended, especially for removing factory emissions components and installing the EGR cooler delete parts.

Q: Will this fit cab & chassis models?

A: This kit is designed for standard GM Silverado HD and Sierra HD pickup trucks. Cab & chassis models may require additional modifications and should be verified before purchase.

  • 5 stars: 4 (44%)
  • 4 stars: 3 (33%)
  • 3 stars: 2 (22%)
  • 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.
H
Hank Boudreaux
You need the 3-hole downpipe flange — this kit has it

2015.5 LML uses a 3-hole turbo flange, not the 4-hole from 2011-2014. I learned this the hard way with another brand's kit. The TruckTok system includes the correct 3-hole downpipe and it bolted right up. The gasket is multi-layer steel, not a paper one that blows out. The 5-inch downpipe has a smooth mandrel bend from the turbo flange all the way back. No neck-downs anywhere in the system.

C
Charles Lawless (United States)
Great product

Great quality

B
Beau Stockton
Save your factory exhaust — you might need it down the road

Took me about 4 hours solo. The hardest part was removing the factory DPF assembly intact. If you are in an emissions-testing state like me, you want to keep the factory exhaust in one piece. I was able to remove it without cutting anything by dropping the transmission crossmember for clearance. The TruckTok 5-inch pipe went in clean — all slip joints fit tight and the band clamps pulled everything solid.

J
Jordan Cress (United States)
5” exhaust

Fit like a glove, good quality clamps

C
Colt Mabrey
Late LML DPF is the worst one GM made — delete it

2015.5 Silverado 2500. I have owned an LB7, an LBZ, and now this LML. The LML DPF is by far the most problematic. It regens constantly, it cracks internally, and the DPF differential pressure sensor fails regularly. This TruckTok 5-inch system permanently removes all of that. The engine runs like a Duramax should — smooth, responsive, and cool. The 5-inch pipe makes a real difference in sound quality over the 4-inch kits. 30K miles on it, zero issues.

C
Colt Prather
2016 LML — zero fitment issues on the last year

My 2016 Denali HD was the last year of the LML body. The exhaust routing on the 2015.5-2016 is slightly different from 2011-2014 because of the CP4.2 pump clearance. This TruckTok system is clearly designed for these years — the downpipe clears the transmission and the 5-inch pipe routes around the spare tire without rubbing. All factory hangers fit and the polished tip exits at the stock location. Took a Saturday with basic tools.

R
Rusty Weatherby
2015.5 LML — 5-inch over 4-inch is worth the upgrade

2016 Silverado 3500. The late LML (2015.5-2016) has the CP4.2 pump and the factory DPF chokes the engine just as bad as the earlier trucks. Went with the TruckTok 5-inch downpipe-back system instead of a 4-inch and I am glad I did. EGTs under load dropped 180 degrees compared to my buddy's 4-inch delete on the same truck. The 5-inch pipe moves more air and the tone is deeper. If you tow heavy, skip 4-inch and go straight to 5.

D
Dusty Fontenot
15 to 20 mpg — and the CP4 finally gets clean oil

2015.5 Silverado 2500. The factory DPF regen cycle was dumping fuel into the cylinders and my oil was black by 2500 miles. On a CP4.2 truck that is a recipe for disaster. Deleted with this TruckTok 5-inch system and a tune. Oil now stays clean past 7000 miles. Fuel economy went from 15 to 20 on the highway. The 5-inch pipe gives it a deep growl at idle without being obnoxious on the highway.

W
Waylon Hightower
The 5-inch tip looks aggressive on the LML bumper

The late LML with the factory square exhaust tip cutout looks great with a 5-inch polished tip filling the hole. The TruckTok tip is double-walled with a rolled edge — it does not look like a thin-walled pipe jammed through the bumper. The 5-inch size fills the factory cutout perfectly with just enough clearance. No rattling against the bumper bracket. This is the visual upgrade the LML needs to match the delete performance.