First, let me say I'm new to this site and glad to have found it. Back in October 2010 I had purchased my first Mustang. Its a 2011 V6 Kona Blue. What an awesome car it is. The first mod I did was to get rid of the stock mufflers. I strongly recommend getting the Flowmaster exhaust system for your 11 and up. My opinion, the Flowmaster exhaust system sounds the best on Mustangs and the best compared to any other after market exhaust . My V6 sounds louder than a stock 5.0 with the Flowmaster and costs around 400.00 dollars.