I have a MAC Catback exhaust on my 1994 Z28 M6. I wanted to know if i can buy just a muffler to replace the one on the cat back system. The MAC system bolts on using flanges. I wanted to change it because the exhaust sounds like S**t (i would never recommend this exhaust, it is very raspy and pops like crazy when you come off the throttle). Any help would be greatly appreciated.

 

I had an exhaust shop do mine.

 

You can replace just the muffler. You first need to find out the inlet/outlet diameter on the muffler, then just pick out a muffler with those same dimensions. Chances are it's a 3" inlet and dual 2.5" outlets.