Those trans are shifted by the computer...so to use one you have to swap over the computer with it (and maybe the harness? i dunno about that).
Most people don't bother....BUT, if you're into tuning yourself, this setup can be awesome because you can set the shift points in the tune. Get yourself a duel tune chip and you can have a regular street tune where it shifts normally, then switch over on the fly to the race tune where it shifts at 6500 or whatever. It's a sweet setup when it's done right.