First off if you are even remotely concerned about it being too loud, this exhaust is not for you. The piping is bigger than stock so gains should be had, how much is the question, if you are concerned about gains first then go fast intentions...like everyone else.
You can't sound as close to F1 as possible without accepting that the exhaust is loud. This exhaust is meant for only the fiends that need that SCREAM in their Z.
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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold 
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling
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