best suitable for Turbo or supercharge i guess?? i dunno......oh maybe lower displacement (whatever it is, hihi), higher redline, larger compression ration (can go NA better than H22, some1 told me dat) and OBD-2 ECU which I don't get what's the difference btw 1 and 2 at all...

i hab no clue, just saying what i think might be the reason.