Flowmaster now has a duel sys for the gt, (I heard and saw it on a car, but don;t know anything about it) I do know the size goes with the hp. if you have 300 hp you need 3" exhaust . if you have 250 hp you need 2.5" exhaust if you have 215 hp the 2.25 or the 2.5 exhaust would work just fine . Unless you are tring to set a record on the track then any exhaust Your preferance of manf will do. For me I am still stock, single exhaust factory installed, would better sound but for 600.00 I will just turn up the radio.
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jim
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