Chris - I've found they've been really good with classifying everyone in the past, and if you are too slow, or too fast for your group, you'll get bumped up or down a group!
I've really enjoyed the RENEW days in the past, combo of stock, modded, new and classic cars! And a good price for a weekend, timed day.
time to get back on the horse. I'm in and paid.
GO HARD!