abu i believe the apexi is rated at 420hp?? correct me if im wrong...
just rememebr i think the apexi still runs the ceramic rear wheel! so i have read 18psi is max??
with supporting mods they have seen to make 250 on an rb20 so plenty more for u!
as i have the same setup besides cam gears im looking at 220-240kw! but u will prob find the cam gears to help with some response!
good luck with ur choice!
cheers