Diesel Exhaust Upgrades: Downpipes, Delete Pipes & Exhaust Systems

The factory exhaust on most diesel trucks — Cummins, Powerstroke, Duramax — is built around emissions compliance, not performance. That means restricted flow, elevated EGTs, and turbo lag that leaves real power sitting on the table.

This page covers three categories of diesel exhaust upgrades. Downpipes bolt directly to the turbocharger outlet — upgrading pipe diameter here reduces backpressure right at the source, improves spool time, and lowers EGTs. No tune required on most applications. Delete pipes replace DPF, CAT, and SCR emissions hardware with straight-through 304 stainless tubing — these require a compatible ECM tune to prevent fault codes. Full exhaust systems cover the complete path from turbo to tip, either turbo-back or downpipe-back, and deliver the biggest overall flow gain. All products are direct-fit by engine and year — no universal fitment, no fabrication needed.

Downpipes


GM Duramax L5P 3.5 inch turbocharger downpipe 2017-2024

The downpipe is the first section of exhaust pipe off the turbocharger's hot side outlet — and it's one of the highest-impact bolt-on upgrades on a turbodiesel. Factory units are typically 2.5"–3", which creates backpressure right where you least want it. Upgrading to a 3.5" or 4" mandrel-bent downpipe drops EGTs, cuts turbo lag, and sharpens throttle response across the RPM range. Bolt-on direct-fit, no tune required on most platforms.

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6.7 Powerstroke — The factory outlet on the 6.7 is a genuine restriction point. A 4" downpipe is the first mod most techs run on a deleted 6.7 — you'll feel it in spool time and mid-range pull right away.
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6.6L Duramax (LB7 / LLY / LBZ / LML / L5P) — Every Duramax generation gains from a larger downpipe. The L5P especially — the factory 3" outlet is a known bottleneck on an otherwise capable engine. Moving to 3.5" is a straightforward, no-tune gain.
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Stack it right — A downpipe alone is a no-tune bolt-on. Pair it with a full exhaust system and a tune and you're compounding gains across the entire exhaust path for a serious result.

6.6L Duramax LB7 3" Turbocharger Downpipe | GM 2001–2004

Optimized for turbocharged engines.

6.6L Duramax LLY/LBZ/LMM 3" Downpipe | GM 2004.5–2010

Improved exhaust flow for throttle response.

6.6L Duramax LML 3" Turbocharger Downpipe | GM 2011–2015

Smooth bends for improved velocity.

6.6L Duramax L5P 3.5" Turbocharger Downpipe | GM 2017–2026

Engineered for maximum flow.

6.7L Powerstroke 4" Downpipe | Ford 2020–2025

Mandrel-bent for superior flow.

Delete Pipes


Muffler delete pipe 6.7 Cummins with durable steel construction

Delete pipes replace the DPF, CAT, and SCR/urea system with straight-through 304 stainless tubing. The result: measurable drop in exhaust backpressure, lower EGTs under load, and better fuel economy on long pulls. A tune is mandatory — running a delete pipe without one will trip fault codes and put the engine in limp mode. The ECM needs to be told the emissions hardware is gone. Every pipe below is year and model specific, direct-fit, no cutting or welding required.

6.7L Cummins 4" DPF Delete Pipe | Ram 2007–2012

Improved torque and faster turbo spool.

6.4L Powerstroke Cat & DPF Delete Pipe | Ford 2008–2010

High-flow design for maximum power.

6.7L Cummins C&C 4" SCR Urea Race Pipe Under 70" | Ram 2011–2012

Short-wheelbase Cab & Chassis fitment.

6.7L Cummins C&C 4" SCR Urea Race Pipe Over 70" | Ram 2011–2012

Long-wheelbase Cab & Chassis fitment.

6.6L Duramax LML Cat & DPF Delete Pipe | GM 2011–2015

Optimizes exhaust flow for increased horsepower.

6.7L Powerstroke Cat & DPF Delete Pipe | Ford 2011–2025

Built for enhanced durability and performance.

6.7L Cummins 4" Cat DPF Delete Pipe | Ram 2013–2018

Engineered to reduce backpressure and EGTs.

6.7L Cummins C&C 4" DPF Delete Pipe | Ram 2013–2023

Stainless steel design for heavy-duty use.

3.0L EcoDiesel Cat & DPF Delete Pipe | Jeep Grand Cherokee 2014–2018

Direct-fit delete for the Grand Cherokee EcoDiesel.

3.0L EcoDiesel Cat & DPF Delete Pipe | Ram 2014–2019

Increase MPG and unleash hidden power.

6.6L Duramax Cat & DPF Delete Pipe | GM 2015.5–2016

Seamless fit and long-lasting quality.

5.0L Cummins 4" DPF Delete Pipe | Nissan 2016–2019

304 stainless steel delete for the Nissan Cummins.

6.6L Duramax L5P Cat & DPF Delete Pipe | GM 2017–2025

Constructed for serious performance gains.

3.0L Powerstroke Cat & DPF Delete Pipe | Ford 2018–2020

Precision-engineered for optimal performance.

6.7L Cummins 4" DPF Delete Pipe | Ram 2019–2024

High-grade materials for maximum durability.

3.0L EcoDiesel Cat & DPF Delete Pipe | Ram 2019.5–2023

Black Bandit Series III stainless steel construction.

Exhaust Systems


Black Bandit Race Exhaust Ford Powerstroke 6.7L 5-inch Downpipe Back

Full race exhaust systems give you the most complete flow improvement available. Turbo-back systems replace everything from the turbocharger outlet to the tip — maximum gain, full system. Downpipe-back systems start after the downpipe, replacing the mid-pipe, DPF section, and muffler. Both are built from 304 stainless with mandrel bends throughout — no crush bends, no thin-wall tubing. If you're doing a full delete build, a complete exhaust system paired with a downpipe and a tune is the correct combination.

7.3L Powerstroke 5" Turbo Back Exhaust | Ford 1999–2003

Full turbo-back race exhaust system.

6.6L Duramax LB7/LLY/LBZ Downpipe Back Exhaust | GM 2001–2007

High-flow downpipe-back race exhaust.

6.0L Powerstroke Turbo Back Exhaust System | Ford 2003–2007

Full turbo-back system for the 6.0L Powerstroke.

6.6L Duramax LMM 4" Downpipe Back Exhaust | GM 2007–2010

4-inch downpipe-back race exhaust.

6.7L Cummins Turbo Back Exhaust | Ram 2007–2012

Turbo-back race exhaust without muffler.

6.4L Powerstroke 4" Downpipe Back Exhaust | Ford 2008–2010

Full downpipe-back exhaust system.

6.6L Duramax LML Downpipe Back Exhaust | GM 2011–2015

Downpipe-back race exhaust system.

6.7L Cummins C&C 5" Turbo Back Exhaust System | Ram 2011–2018

Full turbo-back race exhaust for Cab & Chassis.

6.7L Powerstroke 5" Downpipe Back Exhaust | Ford 2011–2022

5-inch downpipe-back exhaust system.

6.7L Powerstroke 4" Downpipe Back Flanged Exhaust | Ford 2011–2025

304 stainless steel flanged exhaust system.

6.7L Cummins 5" Turbo Back Exhaust | Ram 2013–2018

5-inch turbo-back competition exhaust.

6.6L Duramax LML 4" Downpipe Back Exhaust | GM 2015.5–2016

4-inch downpipe-back race exhaust.

2.8L Duramax LWN 3" Turbo Back Exhaust | GM Canyon/Colorado 2016–2021

Turbo-back system for the Canyon and Colorado.

5.0L Cummins Downpipe Back Exhaust | Nissan 2016–2018

4-inch downpipe-back with or without muffler option.

6.6L Duramax L5P Downpipe Back Exhaust | GM 2017–2025

Full downpipe-back race exhaust system.

6.7L Cummins Downpipe Back Exhaust | Ram 2019–2024

High-flow downpipe-back race exhaust system.

3.0L Duramax LM2 Turbo Back Exhaust | GM 2020–2022

Cat & DPF race pipe for the LM2 Duramax.

Ready to upgrade your exhaust system? Explore our full range of delete pipes, downpipes, and exhaust systems.

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Frequently Asked Questions


What does a downpipe do?
The downpipe connects the turbocharger outlet to the rest of the exhaust system. Upgrading diameter reduces backpressure right at the turbo, improves spool time, lowers EGTs, and increases flow downstream. Our mandrel-bent units (like the 6.7 Powerstroke downpipe) are direct-fit replacements — bolt-on, no cutting, no welding.
How much HP does a downpipe add?
On a tuned truck a larger downpipe typically contributes 15–30 HP depending on the platform. Our 5-inch systems (like the 6.7 Cummins competition exhaust) can push 25–40+ HP when combined with a proper tune. The downpipe alone without a tune still improves EGTs and spool — it just won't unlock the full power gain.
Do delete pipes require a tune?
Yes — always. Running a delete pipe without an ECM tune will trigger fault codes and put the truck in limp mode. The tune tells the ECM to stop monitoring the removed components. Pair your delete pipe with our Mini Maxx tuners to clear codes and unlock full performance.
Which downpipe fits my truck?
All products on this page are year and model specific — no universal fitment. We carry direct-fit pipes for 6.7 Powerstroke, 6.7 Cummins, and L5P/LML Duramax. If you're unsure, email us with your year, make, and engine code.
Turbo-back vs. downpipe-back — what's the difference?
A turbo-back system replaces everything from the turbocharger outlet to the exhaust tip — maximum flow gain, full system replacement. A downpipe-back system starts after the downpipe, replacing the mid-pipe, DPF section, and muffler. If you already have an upgraded downpipe, a downpipe-back system is the natural next step. Need help choosing? Contact our team.
Can I install it myself?
Most techs knock out a downpipe swap in 2–3 hours with basic hand tools and a lift. Full exhaust systems take 3–5 hours depending on platform. All hardware is included — no sourcing extra hardware.
How does pricing compare to dealer?
Our downpipes start at $220 and full exhaust systems from $440 — versus $800–$1,200+ at a dealership for equivalent hardware. View all options →

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