hoser Wrote:
>
> These "cross drilled" rotors are used in racing
> applications to do exactly what you said. Not
> necessary for the street.
They seem to cover all the types here. I love the internet. (well, mostly... the pictures posted in Off-Topic here make it difficult)
http://auto.howstuffworks.com/auto-parts/brakes/brake-parts/brake-rotors1.htm
Ricers use them because it helps them pretend that they are real racers that need braking performance.