A shop named South Side Performance from Sioux, SD posted some information on some GR6 upgrades.
We have been doing R&D on the GTR transmission for several months now. We have developed a upgraded Kevlar clutch pack with heavy duty internal springs. This will allow the car to put up more power down to the ground.
We have also come out with some new internal hardened gears for harder launches. The transmission is our main focus on the GTR. We are also working on some external issues with the transmission casings breaking on a few of our customers cars. We will post all the new goodies for the transmission and how they perform on our dyno.