Well every mustang I have owned I tell myself I m going to try a new muffler. This time I got my xpipe on with the stock catback but was so sad with the lack of sound that I ended up having some flowmaster super forty fours welded in. Don't get me wrong it sounds freakin sweet. Better than the 05 I had. I think it is due to the muffler not being at the back. Seems to take some of the raspiness away. Funny how just mufflers or a catback isn't enough nor is just an x pipe to get the sound I want.