Flowmaster's American Thunder cat-back exhaust system for the 2007-2009 Toyota Tundra is perfect for the person looking for moderate sound levels with all of the performance benefits that you would expect from Flowmaster. This bolt-on DOR/DOS (Dual Out Rear / Dual Out Side) emissions-legal system for the 4.7L engine features a 50 Series Big Block muffler, 2.50 in. mandrel bent stainless steel tailpipes, and 3.00 in. polished stainless steel tips. This system fits all wheelbases and only fits 2009 models built before 8/2008. The exhaust system in 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.