Hey guys, I am thinking of purchasing a Flowmaster American Thunder Systen for my car. All I have now is a Flowmaster Muffler. I wanted to know if the Cat back system will make a difference in acceleration and high end speed. Is it work the money?? thanks alot

I would say about a 5% increase on performance, or thats what the mags say anyways

the greater the modifications the greater the affect modifying the exhaust has, especially with heads and a cam.

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Hybrid Black 5.7L 5 Speed
'95 Competition Yellow Corvette Coupe ZF6

The only difference between a Flowmaster Cat-Back system and a Flowmaster muffler are the exhaust pipes.

If the muffler is still good, just see how much a shop would charge you to put bigger pipes on...it may save you some money.

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92 Camaro RS, LO3, 5-spd, T-tops

Performance:
K&N Open Air Filter, Edelbrock performer TBI intake, Fastchip Prom, Timing +4 degrees, Centerforce clutch, Xact 8mm wires, SLP 1 3/4" Headers (coated), Flowmaster Catback Exhaust, Z28 Grille w/aftmkt fog lamps, MacEwen white-face guages
Electronics:
Alpine 8030 Alarm System, Valentine One Radar Detector (How did I ever drive without one?), Pioneer DEH 7450 Head Unit w/6-pack CD changer, Pioneer DEQ 7600 Sound Processor, 2 Kenwood KAC-846 Amps powering 2 12" Pro Red subs, 2 Pioneer 6x9 and 2 MTX 4x6 speakers.
NEXT UP: TBI mods, 3.42 gears w/Torsen posi