2017-2025 Duramax 3.5" Downpipe (L5P-EXH-A004)
Description
Fits
| Year | Make | Model |
| 2017-2025 | Chevrolet/GMC | Duramax L5P w/ 6.6L |
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
- 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
- (1) Dirty 3.5" Stainless Steel Downpipe
- (1) High-Quality Exhaust Heat Wrap Kit
Specifications
| Diameter | 3.5" (89mm) |
| Material | T304 Stainless Steel |
| Connection | 4-Bolt Precision Flange |
Original: $261.83
-65%$261.83
$91.64Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
Description
Fits
| Year | Make | Model |
| 2017-2025 | Chevrolet/GMC | Duramax L5P w/ 6.6L |
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
- 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
- (1) Dirty 3.5" Stainless Steel Downpipe
- (1) High-Quality Exhaust Heat Wrap Kit
Specifications
| Diameter | 3.5" (89mm) |
| Material | T304 Stainless Steel |
| Connection | 4-Bolt Precision Flange |
