The Cat Backs available for the Z are definitely not cheap.
I think I am going to get Berks Hi Flow Cats and just have them bolted to the stock exhaust. For $500 + Installation it will definitely make the car sound better then stock (Louder, and throaty) and is probably the best bang for buck performance mod for the 370z. Just cant beat $500.00 and some change for any where between 10 - 19whp.
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2011 Black Corvette Grand Sport 6spd | NNP Daul Mode Exhaust
2008 Trail Blazer SS Black | SuperChips Tune
2009 370Z Black 7AT Touring Sport (TRADED)
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