YOU have to decided or let us know what your goals are. How much power do you want? After seeing a RSX Type S only make 167HP and 116FT LBS... then after like $5k in just broke 200HP it was 201HP with K pro, header, cams... Forget that shit. Boost is the way to go but for a 2 liter thats a pretty piss poor performance. My 1.8 does that + some and was cheaper/easier to work with. And a GSR Turbo will get down. 4 cylinder cars can be pretty shocking even with not so crazy power. Its all power to weight and getting your power to the ground. Unless its a serious V8 most people with V8's and exhaust/intake think they run the streets. Now supercar wise well thats a different story.