Well with the 3in with HFC on the TT it sounds great. Its a lot louder, more exotic like, not raspy.
A 2.5 probably could get to 500hp, but if you ever upgraded to like stage 2 and so on, it would be better having the 3in and if you got 3in now no need to upgrade later on, but thats just my thought.
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AAM Twin Turbo Kit, 500hp/400TQ UPrev 
"America is all about speed. Big, nasty, bad a$$ speed." Roosevelt
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