NASCAR Cup Series cars will use a simplified diffuser on short tracks and road courses this season. As part of a continued push for more competitive racing, Cup Series teams received a technical ...

The NASCAR Cup Series will run a simplified diffuser at a majority of the tracks 1-mile or less in length, as well as all road courses, the sanctioning body announced Wednesday. The change is part of ...

NASCAR made some changes to its Cup Damaged Vehicle Policy following the race at Bristol Motor Speedway. Teams can now replace the diffuser flaps while preparing a vehicle. “NASCAR updated its Cup DVP ...

NASCAR Cup teams and ARCA Menards Series teams will be on track Friday at Phoenix Raceway. ARCA teams will practice, qualify and race at the 1-mile track. Cup teams will take part in a 50-minute ...