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TruckTok 2015.5-2016 6.6L GM Duramax LML 5" Downpipe Back DPF Delete Race Pipe
Brand TruckTok

TruckTok 2015.5-2016 6.6L GM Duramax LML 5" Downpipe Back DPF Delete Race Pipe

SKU DP-0301
$659.00 - $659.00
$659.00
$659.00 - $659.00
$659.00

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Availability:
in stock, ready to be shipped

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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 your truck to verify your turbo discharge style before purchasing!

DESCRIPTION

Product Overview

  • Late-production 2015.5-2016 LML trucks have hit their peak emissions failure window. Soot-choked DPFs, blown DEF heaters, and failed sensors frequently trigger Limp Mode while tanking fuel economy to 13-14 MPG.
  • Furthermore, towing with these restrictions traps intense backpressure, spiking EGTs past 1,300°F and straining the turbo. At this age, mid-section patch pipes aren't enough, as the stock 10-year-old tailpipes and hangers are often heavily rusted and ready to snap.

Key Features

  • Rugged T-409 Stainless Steel Build: Manufactured from industrial-grade T-409 SS, perfectly optimized to expand and contract under intense thermal cycling without cracking or warping.
  • The Deepest Acoustic V8 Growl: The huge 5" cross-sectional area acts like an acoustic megaphone, producing an exceptionally deep, deep-tone rumble that sets your truck apart from standard 4" pipes.
  • Substantial EGT & Heat Reduction: Instantly drops exhaust backpressure, allowing scorching gases to exit the motor rapidly, dropping EGTs significantly under heavy sustained towing loads.
  • Precision 3-Bolt Flange Receiver: Equipped with a heavy-duty, CNC machine-cut 3-bolt flange welded at the inlet, guaranteeing a direct, leak-free bolt-on connection to your 15.5-16 factory downpipe output.

FAQ

Q: How do I know if I have the 3-bolt or V-band flange?

A: Look at the connection between the downpipe and turbo. Early 11-15.5 models feature a V-band clamp (a single circular band with one tightening bolt). Late 15.5-16 models feature a heavy-duty 3-bolt flange (three separate bolts arranged in a triangular pattern).

Q: How loud is it with a muffler?

A: It stays deeper and richer than the factory sound note, but is well-controlled enough for daily driving. The performance muffler effectively takes the edge off harsh highway cab vibrations without killing your V8 tone.

Q: Should I do the EGR delete at the same time?

A: Yes, highly recommended. Since you will already have the factory exhaust dropped, accessing the back of the engine bay is much easier. You can seamlessly pair this install with our LML EGR Delete Kit or full Up-Pipe + EGR Kit .

Q: Will 5" hang lower than stock?

A: No, the system is designed to closely mirror the factory routing layout. Ground clearance remains highly similar to stock, making it perfect for factory height or lifted setups. For heavily lowered trucks, the 4" version stays slightly closer to the frame rail.

  • 5 stars: 4 (44%)
  • 4 stars: 3 (33%)
  • 3 stars: 2 (22%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
Some of the reviews shown are from related products the merchant grouped with this one.
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.