[joeo]

Shoot - already bought some 2" hose! Thanks for the link; not sure why I forgot to check their site for ducting.
In testing, I have picked up a leaf; I just figured for a track event, I'd make sure they were clean.
The factory shields are large enough for a 2" cut; 2.5" might be too large, will need to measure. I ran the hose from the front to the back underneath the suspension, then 180 degrees back. It was the only way to fit 3" hose and still be able to turn lock to lock without the tire hitting the hose. Right now at the lock the hose is so compressed that it pushes the dust shield plate against the rotor; that's why I was/is thinking of going to 2".

The other thing I've been thinking about is spraying a fine mist (maybe 1-10GPH) of water directly into the rotor vent tied to the brake lights using a shurflo pump.