Running MAC O/R H with the MAC Flowpaths and I love it. Sounds great and you can say that you have a Mustang w/o Flowmasters. Not bashing them, they're one of the best sounds ever, just everyone has them. But if I could choose a different mid-pipe besides the O/R H, I'd go with the Prochamber. My buddy has an 02 GT with a Prochamber and MAC Catback and honest to god it's one of the best set-ups I've ever heard!

And I always hear everyone on the site bashing MAC. Heard a lot of it because of their headers, but all my bolt ons are MAC and I haven't had any trouble with them yet (besides the TB, had to tighten the flap screws) and I've been running MAC products since I got my car 2 years ago...