Personally I don't think we've seen enough examples run long term on the streets to make a call. You're also forgetting AAM's turbo kit but that will require an inhouse install, Fusz's Z has it and I believe he's pretty happy with it. I think GTM's success with bullitt's stroker build will show how serious and skilled GTM is.
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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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