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Intake and exhaust and Small scale weight reduction. Wont make a big differnce. Thats the farthest id go. In the end if you want real power Your best bet is to slap on a turbo. Or you can spray.
my best advice is weight reduction, easiest, and cheapest way to get every pony your car has to offer, BFI and exhaust are other great ways but besides forced induction it is pretty limited