Re: Thinking about switching to rear exhaust...
You can get a Gen II take off catback exhaust for shipping cost. Lots of them around and if anybody tries to charge you much more than shipping tell them where they can shove their catback. Tator might have a few lying around. If not him call Levin or Macedo.
Before installing the Gen II system have the muffler replaced with a X-pipe. The HP and loudness will be increased slightly, the note will be increased dramatically.
The expense will be in the side sills and possibly the lower rear bumper (I don't recall if there is an exhaust cutout in the rear on a Gen I).
If you switch, I suggest keeping your original Gen I pieces (exhaust, sills and lower rear bumper section) in tact. With this body style no longer in production having the original pieces available and in good condition will help sell your Gen I if you ever decide to.