I would go with either Borla if cost isnt a issue or or if cost is a issue Magnaflow, GMMG are good and sound awesome too but pretty expensive also, But i thought the Firehawks came with good flowing low restriction SLP exhaust?? you could always put a bullet Style muffler in it like a Loudmouth if you don't mind a lot of interior resonance at 2,000 rpm cruising but if you plan on having headers on your car in the future get one of the other 3 brands
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2002 Z/28 = Firemutt Racing 370 w/ Cam, Trick Flow heads, TPIS 90mm Intake & 90mm T.B., Vigilante 3600 t.c., Michael's Transmissions Built 4L60E.
QTP Headers, Mufflex Stainless Y-pipe, Pypes Performance Exhaust, Moser 12-bolt w/ 33 spline axles,Truetrac & 3:73's., Spohn.
Cartek Tuned...
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