At first I had FI Long Tubes and custom straight piping to the stock muffler with k&n drop in filters plus an Uprev tune. Afterward I switched to a real catback and got the Meisterschaft exhaust. I dynoed after, now I know the tune was set for the straight pipes but the ca was suffocating big time. After adding Injen Long Tubes I got good power through the whole powerband and probably will get more once I get a retune.
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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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