Downpipe fit perfect, no issues!
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Made in Canada
2017-2025 Duramax 3.5" Downpipe (L5P-EXH-A004)
Dirty Diesel Customs
Part Number:
L5P-EXH-A004
Regular price
$470.71 CAD
Unit price
Purchase to earn 470 Dirty Dollars Learn More
Description
Description
Note: Required custom tuning. For Off-Road and Competition Use Only.
Elevate your L5P’s performance and ditch the bottleneck. The factory L5P downpipe is notoriously restrictive, featuring a "crushed" profile that robs your engine of power and sends EGTs through the roof. The Dirty 3.5" Downpipe is the solution, engineered to provide a smooth, high-flow exhaust path directly from the turbo outlet.
Constructed from full T304 stainless steel, this downpipe is built to handle the intense heat and vibration of a hard-working diesel. It features a precision 4-bolt flange that mates perfectly with the factory turbo and works seamlessly with either the OEM exhaust or any aftermarket race system. To ensure your engine bay stays protected, every kit includes a high-quality heat wrap to keep temperatures under control.
We highly recommend pairing this with our L5P EGR Upgrade Kit to address factory system weaknesses simultaneously.
Part Number: L5P-EXH-A004
Why Shop Dirty?
- Canadian-Made Performance: High-performing parts made in-house in our shop in West Kelowna and sourced from across North America with the highest quality standards
- Born in the Shop: Our parts are engineered with real-world experience. Whether it's an OEM fix or a performance upgrade, we build what we know works. We make our parts to solve real-world problems.
- Dirty Made Quality: We aren’t just designing the kits; we are installing them every day in our own shop. We use our own products every day. From the first weld to the last bolt, we build tough gear that actually fits, handles abuse, and looks the part.
Features
Features
- Replaces the restrictive "crushed" OE downpipe and catalytic converter for maximum flow.
- Significantly lowers Exhaust Gas Temperatures (EGT) and increases horsepower.
- Full stainless steel construction ensures long-term resistance to corrosion and heat.
- Direct-fit 4-bolt flange connects to the factory turbo outlet without modifications.
- Versatile design works with both OEM and aftermarket race exhaust systems.
Includes
Includes
- (1) Dirty 3.5" Stainless Steel Downpipe
- (1) High-Quality Exhaust Heat Wrap Kit
Specifications
Specifications
| Diameter | 3.5" (89mm) |
| Material | T304 Stainless Steel |
| Connection | 4-Bolt Precision Flange |
Warranty
Warranty
We overengineer everything we make. It's manufactured to last and tested to prove it, and if by some strange anomaly it ever lets you down, we'll fix it, have a word with whoever built it, and come back stronger. That's the Dirty Lifetime Warranty. Click here for all the details.
Questions and Answers
Questions and Answers
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2017-2025 Duramax 3.5" Downpipe (L5P-EXH-A004)
Vehicle Fitment - Part No: L5P-EXH-A004
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Customer Reviews
Overall rating: 4.9 / 5 from 41 reviews.
Fit well
G’day From Australia, Cory was awesome to deal with and on the ball, was a contract to get the standard dump pipe out without pulling the turbo, but once done the aftermarket pipe took a little fiddling and fell in like a glove, 100% will recommend to anyone over here 🇦🇺
The down pipe fit like a glove. Was a pretty large project to remove the stock down pipe but once it was out it was quick and easy.
Clean and sounds great!
Awesome quality, the weld and the fitment is perfect, got enough exhaust wrap to do the full pipe, probly the best quality/price down pipe on the market
Happy with purchase. Fits perfect. Highly recommend if doing any exhaust modifications.
Fits like a glove! Probably the nicest thing in my truck now and you don’t really see it. Completely changed the exhaust note. If you want any sort of sound out of the L5P this is a must
Fits awesome! All the welds are top notch and the flange perfect. Nice polish stainless! Did Ceracoat mine for protection. You’ll have to remove the turbo to remove the DOC and install the downpipe, get the EGR kit to get all the Hardware and only do the job once. They should come together as a kit. Add a silencer if you don’t want a awesome sounding truck.
Best l5p downpipe in the market hands down
Very high quality part. Has been installed for a year and a half and still looks like new. Fitment was perfect and no issues!
Good fit plenty of heat wrap to cover whole pipe
Fits perfectly worth the extra cost
Fit great
Good quality
Super awesome quality super impressed.
Was rush ordered to me overnight! Nothing but the best service always from these guys!
Love down pipe.
Fit amazing great product
Looks good fits like a glove
Fit great
Fitment & quality is great, never had any issues installing these
Beautiful pipe and workmanship. Good quality. I recommend it to anyone looking for one.
These downpipes are awesome, I've installed them on a number of L5Ps and you can notice a big improvement in spool up and torque and obviously getting rid of the cat convertor which should never have been there in the first place.
Fits perfectly, very good quality and sounds amazing with a 5” straight pipe
These downpipes fit perfect and flow way more than the oem, highly recommended!!
Sounds phenomenal.
Great fit and good price, thanx again!!
Love this item. Fit perfectly and was an easy install.
Downpipe went in pretty easily! Not as bad as I thought it would have been but the truck sounds entirely different with this mod. Thanks so much !!
It fits good didnt have to take the turbo off or lift the cab like some rumours that I was hearing really good craftsmanship on the pipe and was delivered fast
Excellent build quality. Fits like a glove
New smell when installed stinks really bad other then that it’s good just a lot of install work
Great looking product
Good, easy install, wish it had a little more heat wrap
Parts are well made worth the money
Fit like a glove, sealed perfect to turbo and using factory mount to block no fitment issues!
Great quality. The welding looks strong..and pretty!
Was very well-made and bolted up well
Works awesome fits great no problems
