High-Flow Up-Pipes (OEM-Length) Optional Downpipe | 2017–2024 L5P Duramax 6.6 (2500HD/3500HD)
- High-Flow Up-Pipes (OEM-Length) Optional Downpipe | 2017–2026 L5P Duramax 6.6 (2500HD/3500HD)
- Sasquatch Diesels
- Kit add-ons are found below. The more you add the more you save!
Kit Add-ons
Click "add to kit" to add an item to your kit. The more you add the more you save! Included items can be removed from your kit by clicking the red button "remove from kit". You can only have a Full Exhaust or a DPF pipe added to a kit at a time.
Product Details
OEM-Length Replacement High-Flow Up-Pipes (L5P Duramax)
GM gave the L5P a lot of power from the factory, but the stock up-pipes are a known choke point. The OEM-length replacement high-flow up-pipes are a direct bolt-on upgrade designed to reduce restriction and help the turbo breathe easier—without changing the factory-style layout.
The high-flow design increases exhaust airflow by up to 46% by enlarging the OEM bottleneck area and smoothing out restrictive bends. The result is improved exhaust efficiency, reduced backpressure, and lower EGT potential under load.
Key features
- Up to 46% increased exhaust airflow / larger flow area vs. stock
- OEM-length, direct bolt-on replacement (no custom fab required)
- Heavy-duty stainless construction with internally-sleeved bellows built to handle heat, pressure, and engine movement
- Stainless gaskets included
OEM cross reference
- GM Equivalent P/Ns: 12676611, 12688021
Fitment
-
2017–2024 GM 6.6L Duramax (L5P) up-pipe kit
Commonly listed for 2500HD / 3500HD Silverado & Sierra applications—confirm by model/year if you’re ordering for a later truck.
What’s included
- Driver + passenger OEM-length high-flow up-pipes
- Stainless gaskets
Notes: Designed to retain factory-style configuration. Always verify fitment before ordering (especially on newer model years and emissions-package variations).
Shipping and Returns Policy
Important Notice: Please Read Carefully
Shipping Costs
Our shipping rates apply to orders shipped within the United States and Canada.
Shipping Times
- Air Shipping: Orders placed with air shipping by 2:00 PM EST on a business day will ship the same day.
- Ground Shipping: Our goal is to process and ship within 24-48 hours during business days, unless your order contains custom tunes that are preloaded which may take an additional 1-3 business days to ship.
Shipping Delays
Please be aware that we are not responsible for shipping delays due to weather conditions, natural disasters, or any other events beyond our control. No refunds will be issued for delays caused by such events.
Special Shipping Information
- Alaska and Hawaii:
Orders shipping to Alaska and Hawaii must select 2nd Day Air. Overnight shipping may not be available for remote areas, and these locations may experience longer delivery times than stated. - Remote Areas:
Some remote areas in Canada and other regions may incur additional shipping costs. If additional fees apply, we will notify you, and your order will be shipped once the extra shipping cost is paid. - International Shipping:
For shipping outside the US and Canada, please contact us through our contact page for assistance. - Large Packages:
All Full Exhausts, Pipes, and Air Intakes ship GROUND!
Returns Policy
- General Return Policy:
Due to the specialized nature of our products, we generally do not accept returns. Most items are VIN-specific or custom-built to order. - Defective Items:
We only accept exchanges for defective items. We recommend professional installation for these items. If a product is defective and cannot be exchanged or repaired, a refund of the original purchase price will be issued upon receipt of proof of malfunction or damage. - Return Exceptions:
In certain cases, we may make exceptions for returns. If your return request is approved, a 30% restocking fee will be applied. All items must be returned in their original packaging, and return shipping costs will not be refunded. - Cancellations:
All sales are final. If you cancel your order after it has been placed but before it has shipped, a 5% processing fee will apply. - Non-Returnable Items:
Certain items, such as hard parts (e.g., EGR kits, DPF pipes/exhaust, pyro kits, throttle valve kits, exhaust tips, and intakes), are not eligible for return unless an exception is made. If an exception is granted, a 30% restocking fee will be applied, along with the cost of return shipping.
Contact Us
Before returning any items, please contact us for specific shipping instructions.
Customer Testimonials
Sasquatch Diesels transformed my truck's performance!
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