I just installed the MAC AXLE BACK EXHAUST STAINLESS STEEL WITH 4" ROLLED TIPS GT/GT500 2005-2010 on my 2006 Mustang GT. The install only took a little over an hour. Some slight 'tweaking' on the hangers was needed to get the tips centered around the back bumper. These mufflers sound amazing and look great. I couldn't be happier with my purchase!