I have the K&N as well. Bought it off a member here for 110$ shipped. If you floor it, youll hear its beefy sound, and if you drive normally, you sound stock. I love that factor. Honestly at higher RPMs, over 8k, I do feel a slightly increased power gain, and harder pull/shift. I couldnt really chirp the tires from 1-2 stock, but with the intake I can easy, unless I was doing something pretty wrong heh.
2007 6-Spd Phantom Blue 8