Chuckwalla re-surfaced the track last month. We ran a lucky dog endurance race there and have been cleaning out track material from the car since then. I expect the track to be significantly cleaner for our upcoming event than it was for the race we did, but it is significantly slower (3-4 seconds for me), than normal. Driving off line was like hitting ice - great car control practice! Have fun and don't expect to break any PRs!
I've never had so much track "dirt" on a car before. Material build up on the wheels caused severe vibration etc. Here are some photos of carnage on my zebra car: https://www.dropbox.com/sh/d1mw56xa034b ... y0wda?dl=0
That air filter was brand new before the event - it is now completely clogged, and unserviceable.