almost 40 bhp isint a big jump so a super charger is a good start, otherwise
a good induction kit
stainless steel exhaust
stainless streel 4 branch manifold
bigger injectors
upgraded sparkplugs, and leads and a remapped ecu
small engiene hondas are good for getting hp out of the above mods, not saying you'll get 40 bhp from this, but wouldnt be far off
im hoping to get 50 bhp from the above for mine
look at the prelude section, and post calles im hoping to achieve, and you'll see what i mean
anyway, welcome mate