I have had great luck with my LS8 Sport. The tranny is fairly firm, but I know a TC locker would help out. We drove a V6 and it was VERY lacking in power. I bet a turbo or Vortech would liven things up on the LS6. Granatelli is supposedly making a TT kit for the 8.
When you close on it, see if you can get them to put the Borla exhaust on it and roll that into the financing. That's good for about 8-10HP.
Get the extended warranty, too. Just good sense with an MTX.
Also, what color is it? int/ext? Is it Sport?
