October 5-6, 2013
Double Regional / Time Trails
Buttonwillow Raceway Park
SANCTION #:
13-R-2470-S/13-R-2471-S/13-CT-2472-S

REGIONAL GROUP 1 AS/GT/SP/EP/ITE/Touring SATURDAY SUNDAY GROUP 3 It/B-Spec/HP/FP/STL/GTL/T3-4 SATURDAY SUNDAY GROUP 4 SRF/FF.F5/FST/TR SATURDAY SUNDAY GROUP 5 Formula/Sport Racers/S2/CS2 SATURDAY SUNDAY GROUP 6 SM SATURDAY SUNDAY