Car now has longtubes, off road Y pipe, and cutout installed. I also put a new (to me) rear end under it. I couldn't get the last one to stop howling so I found a used unit and installed it. Still has 3.73's, and doesn't howl at all.

Here's a couple clips that I made for an interested buyer (and one to bust my buddy's chops).

Showing dash, and a short start-up
YouTube - LS

Revving a bit with cutout closed
YouTube - Walk around LS1 part 2

Revving a bit with cutout open
YouTube - Walkaround with cutouts open