Got a new (old) cat-back 2.5" exhaust with 4" tip for $50 off of a friend. Sound clip:
http://www.youtube.com/watch?v=ulB50ULmmaU
(rattle is one of the rubber mounts having fallen off, and the two mount points touching and vibrating.)
A couple of vids from a recent motorkhana day as well:
http://www.youtube.com/watch?v=1nFSkLn2tOg
http://www.youtube.com/watch?v=lVQicf7i24I