This was on the post last week by "Revin" (the Gundaker's IOW handle) titled "Gold Crown" Campers are rolling in USAC/POWRI Midget 3 days":

Class Rules:

Midgets:
Same rules apply as previous events with the addition of the Rev-Limiter
USAC/POWRi Membership is NOT required
National USAC/POWRi Points will be awarded
Hoosier four corner tire rule will apply
Left Rear D12 or harder
Right Rear SP2, 3 or 4
Mufflers not required
Rev-Limiters will be used