I have an used K&N drop in filter, model number 33-2031-2. It was on my 2000 G, and it will fit on any P11. Actually this should fit on P10 as well if I didnt remember it wrong. Kinda strange, but it fits on Nissan Maxima too. I paid about 50 bucks for it, used for about 10k miles, perfect condition, everything perfect, just some dust on it(cleanable). I am selling it for 35 bucks shipped.