Rep Power: 0

I got a 2004 ex civic with the factory d17a2. i've installed an aem v2 ram air intake, and a magnaflow cat back exhaust. i've heard diff routes to go with gettin some serious power. wife is not entertaining the idea of throwing a k20 in it so what steps could i take to get some serious gains natural aspiration is the way i am lookin to go.

 
Rep Power: 348

i mean, you can spend a bunch of cash on internals, but by the time you get the power you were looking for you will have spent enough money to buy a k20. id go with turbo if i were you.

 
Rep Power: 297

some high compression pistons, n/a rods, stage 3 crower cams, retainer/spring kit, full exhaust, aem ems, etc. ,etc. and a good tune. wont be as fast as forced induction and only one person has done it so far to my knowledge.