This is a fun event for your street or race car. The CT group is primarily for race cars and requires a transponder.

Here's the info:

http://www.wdcr-scca.org/TrackDaysTrials/tabid/1609/Default.aspx

Rules:
http://scca.cdn.racersites.com/prod/assets/2014_PDX_CT%20Driver_Rules_final.pdf

Supps:
http://www.wdcr-scca.org/LinkClick.aspx?fileticket=4ZGEE7RanZ0%3d&tabid=140 2&mid=3735

Registration:
http://www.motorsportreg.com/events/...5#.U7VvEELD-00