Calling on all Tiptronic owners who are interested in this mod. There is a group buy running at the following place:
http://www.caymanclub.net/cayman-ven...rest-only.html
If you don't know what an ATB differential is but would like to find out more, you can visit the following website:
http://www.quaife.co.uk/What-is-a-Qu...B-differential
Taken from the Quaife website:
The Quaife Automatic Torque Biasing Helical LSD Differential enables your car to accelerate quicker and corner faster. How?
Simply by getting the power to the ground!

The Quaife differential powers both drive wheels under nearly all conditions, instead of just one.

With an normal open differential, fitted as standard on most cars, much precious power is wasted through wheel spin under acceleration. This happens because the open differential shifts power to the wheel with less grip - along the path of least resistance.

The Quaife differential, however, does just the opposite. It senses which wheel has the better grip, and automatically biases the power to that wheel. It does this smoothly and constantly, and without ever completely removing power from the other wheel.

In cornering, while accelerating out of a turn, the QUAIFE biases greater power to the outside wheel, reducing inside-wheel spin. This allows the driver to begin accelerating earlier, exiting the corner at a higher speed......