On the LX srt why no limited slip? Is it mainly because of "esp"? The LX has an open diff, but the BLD (brake locking differential) functions as the limited slip quite effectively. BLD is an algorythm of the ABS/Traction control system. You'll notice that the LX SRT8 lays two strips of rubber at the drag strip. It also works great on split coefficient surfaces. With one drive wheel on ice and one on pavement, the system has enough torque capacity to spin the high traction wheel. Quaife has a limited slip that we have run successfully at One Lap of America and Targa Newfoundland in a pair of cars last year and for the short term, It might be an avenue that you want to explore. Quaife is located in San Juan Capistrano California here in the States.