I have the opportunity to buy some MAC performance Mufflers for a Mustang Cobra 2 1/2". Will these mufflers bolt on to the Mark and sound well?

If there for a FOX body Mustang they are offset/center configuration which will require some pipe work They are VERY loud too, ut would be alot quieter if they were just mounted to a stock system. Your stock pipes are 2 1/4.

Geno is right. I had a set on my Mustang w/ a Bassani X-pipe that had 2 cats. They're loud!!!! I can't speak for the Mark but, those things sound like they were made for 4.6 Cobras...make the hair on the back of my neck stand up!! Or maybe I should patronize my barber...hehe