Originally Posted by CanadianR

For $2000 US dollars i'd buy a Mugen intake, a good header with a 2.5" collector, and 2.5" high flow cat. If you want to get a good header get something like the Toda header, it usually goes for $980 US, or if you want the best bang for your buck, get a DC JDM 4-1 stainless steel header, which goes for around $350 US.Or you could go for the best out there and spring $1400 US for a Hytech, but i think in your case it might not be the best choice. The Mugen intake is $650 US and it's by far the best intake made for the R. A good high flow cat will run you around $150 US. Depending on the header you choose, you may have some $ left for a good 2.5" exhaust. Then, next year i'd buy a Hondata S200, maybe a fuel pressure regulator, and some adjustable cam gears and take the car to a good tuner and have all that stuff tuned. All this stuff is pretty much maintenance free once installed and tuned and should net you around 15-30 hp at the wheels, maybe a little less, maybe a little more, depending on exactly what you buy; but the power curve of your engine will be much improved.