2017-2023 Duramax L5P DieselR 3.5" Downpipe (255-01301)
The DIESELR 3.5" Downpipe, engineered for the 2017-2023 Duramax L5P, is built to reduce backpressure, improve turbo spool, and lower exhaust gas temperatures (EGTs). Designed for serious truck owners who need better airflow, stronger pulling power, and improved efficiency, this upgrade is the direct-fit solution for increased durability and performance.
Manufactured from high-quality materials, the 3.5-inch diameter design increases exhaust flow, allowing your engine to run cooler and perform better under heavy loads. Whether you're towing, working, or putting your truck through high-performance conditions, this downpipe delivers the durability and results your L5P needs.
Helps keep exhaust gas temperatures in check for engine longevity.
✔Heavy-Duty Build– Constructed from high-temp materials to withstand extreme conditions.
✔Direct Bolt-On Fit– Seamless installation for all 2017-2023 Duramax L5P models.
✔Heat Wrap for Thermal Protection – Helps maintain lower under-hood temperatures.
✔Clamps for Secure Fitment – Keeps heat wrap firmly in place under extreme conditions.
Order Processing Time:
Orders are typically processed within 24-48 hours after the order has been placed.
Custom or special order items may take longer to process, typically 3-5 business days depending on the product and customization required.
Shipping Methods:
Standard Shipping (3-7 business days - location dependent)
Express Shipping (1-2 business days- location dependent)
Packaging:
All parts are securely packaged to better prevent any damage during transit. Fragile or high-value parts will be packaged with additional protective materials, such as bubble wrap or foam padding.
Shipping Rates:
Shipping rates vary based on the size, weight, and destination of the package. You can view the estimated shipping costs for your order during the checkout process before placing your order.
Order Tracking:
Once your order has been shipped, you will receive an email with the tracking number and carrier information. You can also track your order status by logging into your OCDiesel account.
USA Shipping:
We ship to the USA! (Except California) Please note that USA shipping rates and delivery times may vary based on destination. Customers are responsible for any customs fees, import taxes, or additional charges that may apply.
Not all products are stocked in-house. To ensure you receive your desired items promptly, please check for availability before placing your order. Some products may be backordered due to high demand or supply chain constraints, which could result in longer delivery times.
We strive to keep our inventory updated regularly, but availability can change quickly. For the most accurate information, contact the OCDiesel customer service team using either this link, or the chat bubble on the bottom right of this page.
Most items are eligible for return within 30 days of shipping, provided they are unused, in original manufacturer packaging, and in resalable condition. All returns & cancellations are subject to restocking and cancellation fees.
Returns must include a Return Authorization Number (RA #) and be shipped with tracking. Return shipping costs are the responsibility of the customer.
Custom/special orders, electronics, and digital goods are final sale—no returns, refunds, or exchanges.
For full return instructions, fee details, and conditions, click here.
