WOW!
I installed my mac off road x-pipe and magnaflow cat back on friday!
it is really amazing! it's only loud during acceleration, which is perfect just want i wanted. idle sounds stock, maybe just slightly deeper/louder. absolutely no drone in 5th gear at high speeds! oh it also doesn't burble or crackle and pop during deceleration! :toothy9:

had to buy o2 extensions however but not to worry a mustang shop had them in stock when i installed them!