Flowmaster (817541) American Thunder Rear 409S Stainless Steel Dual Exit Cat-Back System with Moderate/Aggressive Sound Stainless Steel Construction Multiple Exit Styles Provided in Kit Designed for the Crew Cab, Standard Bed (6.5 ft.) models only, this bolt-on, emissions-legal system features a stainless steel 50 Series HD muffler and dual 3.00 in Patented Delta Flow technology Lifetime Limited Warranty