Doug,
One of the groups we run with at the Glen, PDA is a very loose run organization. So far they are not banning the single hoop Cobras. Good for you, bad for instructors. Lots of different cars and trucks run at the Glen and the advanced groups run pretty fast. They have three run groups, I suggest you ask for novice group for your first trip to the Glen.
Go to their site for more info...
www.imp-auto.com
Cranky
