There's one available in this forum...just look for it in the "search" section. I have mine replaced with Magnaflow and I'm very happy with it as well as the others that had their stock muffler replaced. Sounds great and more V8'tish. Take time for it to break in in a couple of miles before you'll notice the HP increase. Couple it with the chip and you'll be flying...
I beat a Z4, a modified 300 GT and 2 RX8s bigtime in my current set up.

Just a favor, can you scan the dyno of the Magnaflow with the Mustang for this thread or in your album? It's in your box and it's very helpful in this forum. Thanks.

Just follow the rules of the launch as per WMichaels advice.