Dreamer is absolutely right. It is not just about making peak boost but making efficient power. Ideally you want to make peak #'s at as minimum boost as possible. I honestly think if Dreamer had gone ahead and retuned the setup for long tube headers there might have been some gains. I have the F.I. Long Tube Headers on my naturally aspirated setup and they provide a big increase in torque throughout the powerband.
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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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