you won't get more than 20 horsepower out of that tiny engine unless you go forced induction (turbo, supercharger, nitrous oxide), and even 20 horsepower would be a lot. don't listen to what the companies say, an intake won't give you "15 hp", it might give you 1 horsepower to the wheels, and even that is a stretch.
but heres some things you can do:
underdrive crank pulley
headers
aluminum flywheel
plenum/phenolic spacer
new intake manifold
test pipe/race pipe/offroad pipe to delete your catalytic converters.
and you might also want to look into upgrading your suspension:
front and rear strut tower bars
coilovers, or go the cheap route and get lowering springs and new shocks and struts
front and rear sway bars.
you can also look into new brakes and things like that, good luck.
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