hey i have started buying parts for my skyline (greddy style intake, top mount exhaust manifold, stealth intercooler, haltech ecu) but now i want to know couple things about this turbo im looking at, it has different size trims or A/R its a T04Z ball bearing garrett . im looking for one to give me quick response and im only looking for around 400-500 hp to get out of it, i know smaller the quicker but when would it be to small and start making me lose top end power?
different A/R .70 .84 1.00 1.15 1.32?
also i only have standard injectors so what size should i go....550cc or 740cc.