however you should note that any increase in temp of exhaust gases will in the long term destroy your stock cats, they simply aren't built for the heat. People have been using catbacks. You should be ok with TP's and not see any loss in power but big issue was matching F.I. + VVEL + aftermarket headers.
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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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