2017-2023 Duramax L5P Dirty 4" CAT & DPF Race Pipe w/ Muffler (DDC-3GM17M)
The DDC-3GM17M is a 4" CAT and DPF Race Pipe kit designed for 2017-2023 L5P Duramax 6.6L trucks. This system replaces restrictive factory components with high-flow 4" piping to boost torque, improve fuel efficiency, and unleash a deeper, more aggressive exhaust tone. Built for long-term reliability and a precise fit, this kit allows your L5P to breathe properly and perform at its peak.
Why Shop Dirty Exhausts?
When you buy from Dirty Diesel, you’re buying peace of mind. We’ve put in the work to bring you exhaust systems that meet our strict standards for durability and flow. Every kit is vetted for a precision, bolt-on fit, ensuring you get a high-performance system that sounds as good as it performs, without the headache of poor fitment or subpar materials.
- 4" High-Flow CAT & DPF Race Pipe
- T409 Stainless Steel Construction
- Includes Muffler for Refined Sound Control
- OEM-Style 4-Bolt Flange for Secure Sealing
- No Sensor Bungs Required
- Boosts Torque & Fuel Mileage
- Easy, Straightforward Installation
- 4" CAT & DPF Race Pipe
- Muffler
Fits Crew Cab Short Box trucks directly; other configurations may require modification. Only fits models equipped with the OEM-style 4-bolt turbo direct pipe flange. Custom aftermarket tuning is required. Designed for competition/race use only.
Please note that actual products may differ from images shown on our website. While we strive for accuracy in product listings, manufacturers may make changes to design, contents, color, or packaging without notice. Product images are for illustrative purposes only and may not represent the exact item you receive.
By purchasing, you acknowledge and accept that variations may occur and release OCDiesel from any liability related to product appearance differences.
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 & pricing can change quickly without notice. For the most accurate information & pricing, 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.
On products with status "Contact for availability" please contact us before ordering to confirm availability. Orders placed without prior availability confirmation are subject to current lead times and our cancellation/restocking policy.
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.
