Dont get a skyline or silvia, they are the new COMMONdore. I know there is a blitz supercharger kit u can get for the celica 2zz-ge, so i imagine it could be used on the corolla. There is less fn around with a supercharger, but they tend to be pretty expensive compared to turbos. My siters boyfriend turbo charged his nisssan micra (plates REVERB if any1 has seen it around) and that has 107kw at the wheels compared to the original 33kw. If you got a spare 6 grand or so you can get a very good turbo setup. I recomend stainless steel manifold or steam pipe. Dont get a mild steel manifold cuz the welds easily break and fly into the turbo and you can imagine what happens then. Shop around for computers. U really need to replace your ecu, cuz piggy back ecu's are pretty limited. Other things that need changing include injectors, fuel rails, fuel pump, distributer etc. Try and get a ball bearing turbo(rather than roller bearing) since they spool up quicker. I magine a new head gasket is in order for sportivo given the high compression Whatever u do make sure its done properly from day 1, otherwise cutting corners equals blown engines. Spend the extra money and get it done properly.