DP-0299 2017-2023 6.6L Duramax Dp-back 5" DPF Delete kit

2017-2023 DURAMAX 6.6L 5“ Dp-Back DPF Delete Race Pipe

Improve the performance of your motor!

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How it Installation?

Installation instructions

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Step 1 :

Loosen the flange that secures the downpipe and DPF/exhaust pipe assembly. Remove all factory plugs and ventilation holes from the diesel particulate filter, tie them to the truck frame or remove them from the clamp connection.

Step 2 :

Remove the clamp from the downpipe of the turbine. Loosen the bolts on the fixture to a sufficient degree, and then use a flat head screwdriver to pry the fixture out of the flange at three positions. Remove the clamp. (Note: Keep the inventory clip as it will be used with the new system),

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Step 3 :

Place the metal hanger on the downpipe #1 into the upper hole of the hanger bracket or rubber insulation board removed in step 5 above.Install the downpipe using the factory produced turbine belt clamp. Clamping fixture Down, so it can hold the pipe in place, but the pipe can still move. Re fix the hanger bracket to the transmission with bolts.

Step 4 :

Install tube #2 and the required extension tube based on the wheelbase length.Install mufflers and clamp hangers on the shaft neck and exhaust pipe，Insert a metal hanger onto the rubber insulator.

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Step 5 :

Starting from pipeline #1, tighten the vortex band clamp and continue tightening until the rear connection is reached, checking the gap during tightening.

Step 6 :

1.Install the bracket. The M10 bolt will be screwed into the support bolt. Secure the transmission dipstick to the bracket using 1/4-20 bolts, nuts, and washers.
2.The bracket will hold the coolant hose connector in place.

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TruckTok 2017-2023 6.6L GM DURAMAX L5P 5

TruckTok 2017-2023 6.6L GM DURAMAX L5P 5" Downpipe Back DPF Delete Pipe

$715.00

FITMENT

2017-2023 6.6L Silverado & Sierra Duramax 2500HD/3500HD trucks.
Fit Crew Cab, Double Cab, Regular Cab with Standard/Long Bed.
Does NOT Fit: 3500/4500/5500 Cab & Chassis commercial models.

DESCRIPTION

Product Overview

The 2017–2023 Duramax L5P is heavily choked by two factory bottlenecks: the restrictive under-cab DPF/CAT filter blocks and the rough, narrow 3.5" downpipe directly behind the turbo. Over time, these components plug with ash, triggering frequent, fuel-guzzling regeneration cycles that drop mileage to a poor 12–14 MPG.
Additionally, the fragile L5P emissions network is highly prone to DEF heater, pump, and NOx sensor failures that instantly trigger a 55 MPH Limp Mode countdown. Forcing exhaust through these combined restrictions traps intense backpressure, spiking towing EGTs past 1,300°F and shortening turbo life.

Key Features

Industrial-Grade T-409 Stainless Steel: Crafted from heavy-duty mandrel-bent T-409 SS to withstand intense thermal expansion and contraction cycles without cracking, warping, or scaling.
Ultimate EGT Heat Dissipation: Instantly dumps scorching exhaust gases from under the cab, significantly lowering engine and transmission operating temperatures under heavy sustained towing loads.
Massive 5-Inch Competition Flow: Upgrades the entire path to a 5" diameter, dropping backpressure to near zero for maximum high-RPM power headroom and a thunderous, deep-bass V8 straight-pipe roar.
Thick Machined L5P 4-Bolt Flange: Features a heavy-duty, flat-machined 4-bolt square flange that seals perfectly against your factory turbo direct downpipe output, ensuring zero leaks under intense boost.

FAQ

Q: What is the difference between the 4" DP-Back and this 5" DP-Back system?

A: The primary differences are diameter, sound volume, and power headroom. The 4" pipe flows more than enough for stock or street-tuned trucks. This 5" system adds maximum airflow capacity for heavily modified trucks (aftermarket turbos, larger injectors) and delivers a much deeper, louder, full-bass straight-pipe exhaust rumble.

Q: Should I buy this pipe alone, or upgrade to the complete $1,156 bundle?

A: Buy this standalone exhaust if you already own an EGR delete and CAN bus plugs. If starting from scratch, upgrade to the All-in-One Kit to get this 5" pipe bundled with a performance 3.5" downpipe, EGR delete, and 17-19 or 20-23 CAN plugs—saving you time and money.（Tuner need be purchased separatel).

Q: Does a 5" diameter add any real benefit on the L5P's factory layout?

A: On a stock truck, removing the restrictive factory DPF yields identical power gains with either a 4" or 5" system. The 5" diameter only provides a mechanical advantage once you upgrade the turbocharger and push the L5P past 500 wheel horsepower.

Q: Will a 5" exhaust hurt low-end torque on an L5P?

A: Yes, slightly. Because a 5" pipe has a larger volume, exhaust gas velocity drops at lower RPMs, which can soften off-idle throttle response on a daily driven, stock-turbo truck. However, on a built engine pushing over 3,000 RPM, the 5" pipe flows the massive air volume the engine demands.

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