For power your prolly better off with the stock intake, just because with that silly pipe. you will be sucking in soo much hot air, hot air=no power. On the other hand Cold air = more power and better mpg's. As for the k&n filter..... Try blowing through the k&N filter and put your hand on the other side of it. You will feel no air flowing through it. With a K&N its an oil filter, i found it has poor air flow. The oil F***'s up the mass air flow sensor. oil gets on the mass sensor and goes bad. I would never buy a K&N filter ever again. Dry flow cone filters are for the win like AEM, only downside is if water gets on it.
oh by the way i like your bronze color GTP. So much more sleeper