I am still debating on ordering the MAC flowpath cat-back system for my 96gt. I just wanted to hear from anyone with a 96-98gt w/aftermarket h-pipe if it was worth the money. My only fear about buying it is wether it is going to fit properly with a BBK offroad h-pipe.
It will fit, sound great, and look great. As long as you live down south and clean the tips regularly, you should be fine. They should bolt right up to your b-pipe just fine.