My brother just bought a slightly used subaru 2.5 RS and did a little exhaust work on it.

2000 Subaru 2.5 RS
Injen CAI
Borla header
Apex'i N1 catback

There's no video for some reason, but you can hear the sound. I thought it sounded pretty decent for a 2.5

http://www.fquick.com/videos/2000_2_5_RS_reving/2277