You may want to check theses guys out
www.emraracing.org
you would want to look at the Time Trial section... That is what you would run in a street car..
Great group, relatively inexpensive... i plan on doing at least 5 of there events: this is the schedule for 2011
Date Track
April 16th Lime Rock Park
May 21st - 22nd BeaveRun Motorsports Complex
July 23rd Lime Rock Park
July 30th - 31st Lightning @ NJ Motorsports Park
August 27th Lime Rock Park
September 3rd - 4th Lightning @ NJ Motorsports Park
October 1st - 2nd Pocono North Course
November 12th - 13th Summit Point Main Course
Online registration opens 6 weeks before each event. Check back often for the latest event info and registration details.