on an r33 a 3037 is very good look at around 240-250 rwkw @ 1bar or so. but you need a gate and manifold.
it all depends on what you level of commitment is if you want to do injectors afm and ecu .a 2530 or a 40 is great and should make 230 rwkw with stock injectors and aftermarket ecu and bolts straight up cause its internal gate or get you stock one hiflowed but to me thats a bit of a compromise but covers alot of legal issues. t04 e or s is another option but a bit laggy for the s one but they make heaps of power my advise is set a power goal then get a turbo to suit it. if its over 250 rwkw dont expect a lag free turbo
meggala