The Milton CAT Modified Racing Series, also known as the Modified Racing Series, is a modified stock car racing sanctioning body based out of Canaan, New Hampshire. The series sanctions modified races throughout New England. The cars are similar to the NASCAR Whelen Modified Tour modifieds, allowing competitors from the Whelen Modified Tour to race in the Valenti Modified Racing Series. The series draws a large number of fans and drivers to each race, earning itself a well known reputation between track owners, fans, and drivers.