I currently have FI's LTH's with a GTHaus exhaust. Hands down the loudest but still clean sounding Z on here. I've been followed for miles for someone to say dude I'm feeling your car. With that said one problem I did run into was after putting on the exhaust setup my intakes (stock with K&N) were to restrictive. Maybe it was because I got the UpRev tune before the catback install, all in all its probably best done getting some headers, intakes, and catback of your choice with a tune in that order.
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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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