Sounds fun! I went down to Blackhawk Farms with the Windy City Chapter this past Friday. Signed up for Quattroberfest (Friday) and may stick around for Saturday. TBD on RA this fall, a long drive in a loud tin can...

100% agree with Seth - very common in the VW/Audi/BMW community to walnut blast. I have heard of dry ice blasting to clear the underside of vehicles from light corrosion etc.