For the last 2 months or so (before I even had my car :lol I've been going back and forth between different exhaust set-ups. No diffuser, Boss diffuser, GT500 diffuser then Flowmaster Outlaw this or Corsa Xtreme that blah blah blah. Finally settled on the GT500 diffuser along with the black Magnaflow Competition axle-back :rockon: It was hard, ok impossible, to find any videos of this set-up on a GT with no other exhaust mods so I'm going out on a limb a little but I'm not too worried.