First of all, I have a 99 Integra GS.......

For those of you who replaced your stock filter with an aftermarket one, specifically K&N Filter, which one did you use? I know that K&N calls for part # E2427, but I have also read that part #2820 works as well. The lowest price I could find the E2427 for was about $65, while the lowest price for the RU2820 was about $35.

What is the difference between these filters? Will they both fit in the stock box? Does anyone have any experience with either, or both, of these filters?

If they both work, obviously I would like to go with the cheaper one, but I am also a little skeptical because I figure that it has to be cheaper for a reason.........

Any thoughts? Thanks