" if you want a cold air intake, its about $200 and adds about 10-15 hp, an exhaust mod could add 10-20hp. you could also buy a hondata ecu chip for your car, but that's about $500 for the s300. "where the hell do you get these numbers from? I just installed an ARC intake on my K20 and didnt even get close to 10 hp and an exhaust adding 10-20hp? gtfohonestly, save your money, buy a hatch shell for $500, buy a blown GSR, rebuild it, run mid 13's all day. the honda scene is ridicuosly expensive right now, i bought my cold air intake for a little under $560!