Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
Welcome Offer : Use Code WELCOME5 for 5% OFF!
Free Shipping on Most USA Orders
⚠️ California Proposition 65 Warning : Some products sold on this website may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
For more information, visit www.P65Warnings.ca.gov.
Unleash the true power of your L5P Duramax with the SPDZ1 3.5" Downpipe Exhaust, engineered for maximum flow, durability, and performance. Designed specifically for the 2017–2025 Chevy Silverado & GMC Sierra 2500HD/3500HD 6.6L Duramax (non–Cab & Chassis), this upgrade replaces the restrictive factory downpipe with a free-flowing 3.5” stainless steel system built to handle serious power.
By eliminating the factory DOC and improving exhaust velocity by up to 20% more flow than stock, the SPDZ1 downpipe helps your turbo breathe easier—delivering more horsepower, torque, quicker spool-up, and lower EGTs. Built with high-quality stainless steel, a 4-bolt flange with pre-installed studs, and a precision sealing ring, this downpipe ensures leak-free reliability even under heavy towing or track conditions.
Key Features:
✅ Fitment: 2017–2025 Chevrolet Silverado & GMC Sierra 2500HD / 3500HD (6.6L L5P Duramax, excludes Cab & Chassis models) ✅ Performance: 20% better exhaust flow than factory downpipe for more power & efficiency ✅ Material: Premium stainless steel, corrosion-resistant and built to last ✅ Design: 3.5” mandrel-bent tubing with 4-bolt flange & two pre-installed studs ✅ Reliability: Includes high-quality sealing ring to prevent leaks ✅ Power Gains: Faster turbo spool, reduced EGTs, and improved towing performance ✅ Installation: Direct bolt-on design, quality tested for durability and trouble-free fitment
Built to the SPDZ1 Racing Standard, this downpipe is the perfect balance of power, sound, and reliability—giving your Duramax the aggressive edge it deserves whether on the street, track, or hauling heavy loads.
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days. Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.
