If your conversed about drone don't get a flowmaster get the magnaflow or borla it's more expensive but worth it I've talked to borla techs that made the exhaust and they said it actually lost hp with the 2.5" system and sound quality was better with the 2.25 system. So if they said that that's good enough for me
Edit : just now my phone loses the later post hope you enjoy your FSWerks exhaust looks to be a solid peice :) hopefully the 2.5" still provides decent gains :)
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After asking a friend with 07 sedan if he wanted to race " I'm gonna loose! Mines not a zx4!! "