For the 2011-2012 Mustang GT and GT500 enthusiast, being noticed on the street is as important as how the car performs at the track. Fortunately, being heard just got much easier with the introduction of Flowmaster’s Outlaw Axle-back exhaust system, part number 817516. Featuring the race-developed and track-proven Outlaw mufflers finished with polished T304 stainless steel, embossed 4.00” diameter tips, this easily installed system gives both the 5.0L and supercharged 5.4L a very aggressive tone inside and out, with moderate interior sound at 1800-2000 RPM. Manufactured in the USA from heavy-gauge 409S stainless steel, this bolt-on system comes with a limited lifetime warranty, as well as detailed step-by-step instructions for both the do-it-yourselfer and professional installer.