Thinking of doing the same to my 1995, But you have to re-route the rear brake pipes on the rear axle, if you look on rave they show pictures of the two systems, once the brake pipes are re-routed it is pretty much straight forward.
Going to change mine, it has a stainless sports system on, don't know how old it is, but at 50 - 80 mph the noise from the tail pipe gets a bit anoying. thinking of replacing with a standard system, don't think the performance gains are that much.