NASCAR Cup Series teams will compete with a simplified diffuser this season as part of a short track and road course rules package announced on Wednesday.
The updates follow the two-day test at Phoenix Raceway in early December. NASCAR has been experimenting with different packages on short tracks and road courses in hopes of producing better racing.
Details of the updates to the rule book are as follows:
2023 short track/road course splitter stuffers
No engine panel strakes
3-inch spoiler
Simplified diffuser
Simplified diffuser strakes
On the short tracks, the package will be used on at racetracks one mile or shorter with the exception of Bristol Motor Speedway and Dover Motor Speedway. It will not be used in the L.A. Coliseum early next month for the Busch Light Clash.