I recently installed a Mac O/R Pro-chamber & weld-in Flowmaster Super 40's on my 2001 GT. I went with this combo based on hearing it on another mustang & although it's has a nice tone, it's just not lound enough for me. I get compliments but have been more satisfied with set-ups on my previous stangs. I knew that the pro-chamber would mellow the tone but I was certainly expecting more sound. My question is would I be better off installing an X-pipe instead of the pro-chamber (such as UPR or Bassani) or replace the super 40's with original 40's ? I'vs also tossed around the idea of installing the Mac stainless steel catback. Needless to say, I'm a bit torn & unsure which way to go. What would you do ?


