2015.5-2016 Duramax 6.6L DieselR 4" Cat & DPF Race Pipe No Muffler (255-02401)
Built to Last:
Constructed from heavy-duty 16 gauge T409 stainless steel for maximum durability.
Mandrel-bent for a perfect fit and improved airflow.
Improved flanges ensure a leak-free connection.
Effortless Installation:
Includes contour bent hangers and TorcTite® clamps for a hassle-free installation.
Performance Gains:
Expect increased horsepower, lower Exhaust Gas Temperatures (EGTs), and improved airflow.
Unleash your truck's potential and let it breathe easier with DIESELR!
Hear the difference! DIESELR performance exhaust delivers a throatier sound.
- Fit for specific cab and box configurations (EC-CC/SB-LB-Dually) on 2015.5-2016 GM 2500/3500 6.6L Duramax.
- Important Note: This exhaust system ONLY fits models equipped with the OEM style 3-bolt flange on the turbo direct pipe. Does not work with trucks with a V-band clamp.
Off-Road Use Only – Requires aftermarket tuning and is intended for competition use only. ⚠ Regulatory Compliance – Installation on emission-controlled vehicles may violate local laws. Check regulations before installation.
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 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.
