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NASCAR tweaks rules package at select tracks.

NASCAR officials announced Wednesday a tweak in the 2019 baseline rules package for select tracks, adding aero ducts to the three remaining race tracks where a 550 horsepower engine will run, but where cars were not originally required to be fitted with the ducts ā€” Pocono Raceway, Darlington Raceway and the season finale at Homestead-Miami Speedway.

Previously at those three tracks and Atlanta Motor Speedway, NASCAR required teams to use brake ducts or block-offs in that area to help cool the brakes.

The rules packages for the remaining tracks on the schedule have not changed.

NASCAR.com