myself, is planning to turbo charge my geo.. if anyone doesnt know, 93-97 corollas (7th gen) have the same engine as the 93-97 geo prizm.. i have the 1.6L, im going with a .42mm garrett turbo... still doing my research but its all going to pay off. i do know that u can trubo charge the stock motor with stock internals with max 7psi of boost... however, you would need to drop your compression cuz the 4afe motors are 9.1:1 compression ration.... im going with a thicker head gasket, and port and polish both my induction side and exhaust side..im aiming for 7.5:1 - 8:1 compression...if you can get 7:1 ratio, the better... i will keep an update or a thread about my process on turbo charging my car.... message me for any info....