From a press release issued by Deeley Harley Davidson Canada and RACE:

2004 CANADIAN THUNDER RACING SERIES

From Buell (Deeley Harley Davidson Canada) and RACE Events Inc. Shannonville Mortorsports Park

The Canadian Thunder Racing Series was first started in 2002 and was designed to provide a competitive arena for modern air-cooled Twins. Since that time, the series has involved many brands including Buell, Ducati, BMW and Motoguzzi. With Thunder racing at both Shannonville and Mosport, a wide variety of competitors have been able to participate and bring the sound of air-cooled excitement to tens of thousands of spectators.

For 2004, the Canadian Thunder Racing Series will have official undercard status for three national Parts Canada Superbike Championship race dates, the first time ever for the series. These dates will be sanctioned by PMP and RACE and they will consist of four dates at Shannonville and two dates at Mosport with a doubleheader for a total of seven races. Attendance for the six weekends is estimated to be a minimum of 40-50,000 spectators. In addition, two of the respective dates will be in conjunction with the Vintage Road Racing Association 10th Anniversary and the RACE 25th.