mac all the way i will never ever put flowmaster on any of my cars or customer car after i put the mac on my car big differance in sound and a notaciblee power increase over the flowmasters, i always get people asking what kind of exhaust i have on my car and i tell them and they love the way it sounds
ive ran both that mac cat back and mac pro dumps and i always get people telling me that they love the sound of the car. You really can go wrong with either an american thunder cat-back or a mac cat-back. The flowmaster have that classic sound that alot of people love and the Mac's seem to be louder and higher pitched.