yes in fact i own a 180sx with a SR20det, it puts out to the flywheel at factory new 205 hp and 203 torque, roughly, the hyundai puts out about 195 hp and 175 tq. and its new. therefore SR>hyundai
also yes the hyundai engine is the same as the 4g63, BUT! is extremely different (oxymoron yeah?) it is constructed different and totally de tuned, why would Mitsu give a competitor an awsome engine? it is alot worse than the evo engine, so what would be more usefull, get the hyundai tranny and the evo engine, there you go. but i say stick with SR20, the reason why they are quick reving is an equal bore and stroke