I say spend the money to get a full cbe like fast intentions. Never heard magnaflow or flowmaster on a 370z. I have fast intentions cbe with a non-resonated x pipe and carbon fiber mufflers and it sounds freaking awesome. Berk is another popular exhaust around here, but fast intentions is probably the most popular. you can get carbon fiber mufflers also which look amazing. fast intentions I believe have been shown to give the most hp gains also.
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2012 GM 6MT sports package | FI non res cf exhaust | K&N Drop Ins | Viper 3303 security system w/ tilt sensor | GTR start button | 35% rear 45% side window tint | Michelin PSS
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