[silver_pilate]

Baumann or Transgo both make decent shift kits for AOD's and AODE's. They recalibrate how fluid flows through the valve body (the brain of your transmission). They will allow firmer, faster shifts and improve your times at the track. They're relatively cheap ($90-$110) and fairly simple, if tedious, to install.

As for a custom valve body, it's really the best way to go for an AOD or AODE car. Lentech makes one of the best out there (www.lentechautomatics.com). They're more expensive ($379+), but they are also more comprehensive in the changes they make, and they're fairly straight forward to install. For an AOD car, the only other mod that matches it for performance and fun factor gain is the torque converter. I'm not familiar with their performance on the new automatic transmissions, however. They've got a good rep and lots of big names in the auto world use their product.

--nathan