[BiturboS4] ice racing

[David Lau]

You guys from CA try THIS:

What do you do in Michigan in February? Ice racing! Basically, solo
auto-x, in our case, on Saginaw Bay. I did it to practice driving on
slippery surfaces, and learn how the car behaves. Mission accomplished:
Learned what the car does at speed on snow and ice (pretty neutral)
Learned what all-season tires can do (not much good on ice)
Learned what ESP does (very effective in keeping the car going generally
straight on any surface, but KILLS the throttle)
Watched what experience and studded tires can do (it's scary)
Met some nice people and had a heck of a good time.

There were 4 Audis there, among about 20 cars: A4, an AllRoad, and a
nicely lowered older S4, and my Avant. And except for the Mitsubishi
who's studded tire unmounted itself at speed, we all survived without
incident.

David