I'm also looking to install an after-market exhuast on my 95 GS-R and I've heard very good things about the Apexi WS and RS*R Exmag.
I'm about 99% sure I'll be going with the RS*R Exmag when the time comes, but, from what I've read thus far, they don't make RS*R for 4 doors, I've only seen them for 2 doors.
If anyone knows different, please give me a holler, oh, and will the RS*R Exmag have any trouble getting pass the bi-yearly smog test? I hope so...
Peace Out