Flowmaster's American Thunder cat-back exhaust system for the 2011-2014 Toyota Tundra pickup trucks with the 5.7L or 4.6L V8 engines is perfect for the person looking for an aggressive sound level with all of the performance benefits that you would expect from Flowmaster. This DOR or DOS (Dual Out Rear, Dual Out Side) bolt on 409S stainless steel system features dual 2.50 inch tailpipes and 3.50 inch polished stainless steel tips. This system is designed to fit regular cab or long bed, double cab or short bed and CrewMax models. The exhaust system is manufactured in the USA and is covered by Flowmaster's Lifetime Limited Warranty. Designed for an easy fit, this system includes all necessary parts and hardware for installation.