I would either spend big money on a twin turbo kit or stay NA and do the 4.08 final gear. SC kit doesn't give you a big of a change in power especially the torque. 300ish ib/ft doesn't give you much excitement for the money. You will spend $10k for it.
According to a guy had both Stillen SC kit and GTM TT kit, the SC kit gave him some gain over the bolt ons but nothing crazy. Now he switched to a TT kit, he is not steering the steering wheel anymore rather he needs to grab the steering wheel because of the acceleration.
But TT kit will cost you at least $15,000 to do it right. If you decide to stay in NA, I'd recommend 4.08 final gear. Just my .02.
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09 PW 370z Nismo | K&N Drop Ins | HKS Hi Power | Berk HFCs | Work Meister S1 3P | Project Kics R40 Neo Chrome Lug Nuts | KW V1 | SPC rear camber arms/toe bolts | Southbend Stage 3 daily clutch | Southband 19Ib Steel Flywheel | ZSpeed CSC
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