I used to sell magnaflow too and I loved their mufflers, but their cat backs sucked. Definitely not bolt in!!! always had to bend stuff to make them fit right. So just because it's expensive doesn't mean its great. MAC builds a great product for the price and their fit is spot on. I've run nothing but MAC on last three Mustangs and truck. My last Mustang (an 01) was dyno'd at JBA's dyno in San Diego and they were genuinely impressed by the 20rwhp I picked up with just an intake & throttle body from MAC. I eventualy put on MAC ProChamber and 2 1/2" cat back and was smokin Bullits and stayin even with Z28's. Not bad for less than a grand improvements on a car 5 grand less than the Z. I'm not trying to say MAC is the greatest thing since sliced bread, but they do make a good product with dyno sheets to prove it. By the way, does anyone know about the lawsuit against Flowmaster? Seems they were being sued for false advertisement since the only place they're mufflers made horsepower was on their dyno lol.
Ok, off the soapbox.