hey all, i just switched out my magnaflow catback for some mac produmps and i got to say i LOVE the way it sounds now. Even with my full-length headers and off-road x-pipe with the magnaflow catback it was just still to quiet it sounded sick at high rpm but there just wasnt enough rumble. Now with the mac dump its perfect, not to much so that its annoying but i finally got that sick rumble at idle i was looking for. On a side note we put the magnaflow catback on my friends 98 GT and it sounds way better with that exhaust than mine ever did, its crazy that 4.6 sounds way louder with that exhaust than mine ever did and he has stock manifolds and stock h-pipe.