for $500 there's no way you'd be able to go FI (be it supercharger or turbo)
as bootybatman said:
CAI
Exhaust
Camshafts
Ported and polished head
Programmable ECU
but you wouldn't be able to get the ECU as well for under 500
realisitically, i'd do the (reground) camshafts and port n polish the intake/inlet manifold and head, as i think your car already has extractors/exhaust
i don't think you'd get 30kw out of that, but you'd be a lot closer
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