In the following seasons , the team progressed to a winged version of the mini sprint .
In the following seasons , the team raced on Friday nights in Marshalltown and Sunday nights in Jefferson - opening the door for spectating Saturday night 's races at Knoxville .
In the following seasons , the team progressed to a winged version of the mini sprint and raced on Friday nights in Marshalltown and Sunday nights in Jefferson - opening the door for spectating Saturday night 's races at Knoxville .