I have been searching all around and I still can not locate the right part # for the k&N for the 99 RS. I know that it is different from all the other years of RS's. If anyone has this information it would be greatly appreciated!

 

go to nasioc.com, click on the products link on the menu bar at the top of the screen, then click the engine link, then the intake link, and finally the K&N link. But first and foremost do a search in this forum or a search in any subaru forum.