You're statement about "winding it up" is correct. The Z is not a muscle car with large displacement, thus it does not have the low end grunt that you seemingly are looking for. The Z needs to be driven hard to get the move out of her, that's just how she is designed and built and OP take no offense, but you should have known that when getting into her. If I was you I'd go with long tube headers, they won't throw a check engine light if installed properly. If that is to hardcore for you, high flow cats or test pipes are the way to go. You are retaining the stock cats and they are very restrictive. It still won't give you the low end grunt but if you don't feel the power...well you aren't driving her correctly.
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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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