Actually with the K-series engines, you can see quite a bit of power from a cold air intake. They respond better to modifications than the D/B/F/H-series engines. I've actually seen dyno sheets that did in fact show upwards of 10-12whp gains, something that could never be claimed with the other Honda/Acura engines (with a few exceptions). Personally I would go with Injen, if they make them for your car, that seems to be one of the best intakes for the K-series.