I've been looking around for an air intake system for my car. I can't seem to find any kits on the net. I'll post a pic later and see if I can mod another kit. My car is a 95 1.8L Impreza.

My car

try a weapon r for a newer 2.2.I got one from where i work it said it fit a 99 but it did not. Tube was bent wrong and had mass air adapter witch my car does not have. But it looks like it would fit your car.I got an AEM for a 00-01 rs and it worked great.Just had to drill a hole for the air temp sensor.

i saw this on ebay
i think it would fit
http://i22.ebayimg.com/02/i/01/11/79/79_1.JPG

http://images.cardomain.com/member_images/7/web/319000-319999/319358_5_full.jpg

man this kit is all i need
its a 99 2.5 rs
its exactly what i need

glad i could help

Or you can save $99 and make your own:
http://www.mongrelmotorsports.homestead.com/Subaru~ns4.html
http://www.mongrelmotorsports.homestead.com/files/ramair.JPG
It all depends if you're into function or 'bling'. ;)
More at: http://www.mongrelmotorsports.homestead.com/subaru.html