Frankly, i habe bene mucking around Skylines for 10 years, (others far longer) but to this day the most impressive street car i have driven and been in was an R33 GST25T with HKS 2530, Greddy inlet and 256 cams. The thing was more responsive then std, mdae 230rwkws and i would loved to have seen the torque curve. It ruled on the street. Track it wa a bit breathless over 6,000rpm, but it was all round better then the HKS T51, 3040, Trust T67 , Turbonetics T66 etc that followed the 2530