Notes: Flowmaster announces the release of our new American Thunder ® performance exhaust kit for the 2005 - 2007 Ford Mustang V6. It features a specially-designed, 5” X 10” muffler, which offers minimal interior resonance, and a deep V8-style exterior tone. This kit has shown a measurable fuel efficiency increase. The kit installs easily, and comes complete with hardware and installation instructions. The kit is finished off with a 4.00-inch, stainless, embossed exhaust tip.