93StangLX

My buddywanted me to ask you guys this question he just purchased a stock 89 gt but is having problems with what exhaust he wants he is chosing between flowmaster american thunder cat backs with a mac prochamber o/r H or Mac catbacks with a mac prochamber o/r H..He is loooking for deep and very loud what would make his happy flowmaster or Mac?

FoMoCo

I would go with the Flowmaster american thunder. But if you have flows, why does your buddy want to ask us, not you?

StangTangGT

Man I have the mac pro dumps, and let me tell you, best exhaust investment ive ever made! Sound sooooo bad ***, not to mention are $200 for the whole catback and have a black powdercoat finish. These things scream! Wish i had an exhaust clip for ya. And i have an 89 gt with BBK equal length headers and an off road h pipe.

OnyxCobra

Flowmaster.

nitrous_bob

they sound identical..i have all mac on my car right now. w/ pro-chamber

used to have mac headers, flow's cat back , mac reg off road h-pipe

this is now....

92hatchLX

Those MAC dumps don't take away too much backpressure do they? I've got a straight piped (2.25 inch) cat back right now and I need my back pressure back. I'm seriously looking into them to finish up my exhaust.

fastfox86

I've got bbk shorties with an o/r H and MAC mufflers and it sounds badass. The flows and MACs sound similar, but the MACs just sound a little bit different to me and I love them.

stanglx2002

you wont need back pressure as soon as you do your gears

also i have heard the MAC are louder then the flows IMO i dont like flows thats why i went with dynomax ultra flows

nitrous_bob

yeah you do...i drove one of my cars home w/ open headers 1 night, cuz some parts were missing for the exhaust after i did a clutch in it.

it was AMAZINGLY slow....and it had 4.10's .....stockish 5.0's need backpressure to run good.

HC_CrAzYHoRsE

i vote MAC, they're cheaper and look so damn good... can't comment on the sound though, never heard them.