NASCAR has penalized four teams for rule violations last weekend at Chicagoland Speedway, with Clint Bowyer’s Number-15 Michael Waltrip Racing Sprint Cup Series team receiving the stiffest sanctions.

NASCAR’s penalty report released Wednesday referenced six different sections of the 2015 rule book that were applicable with the discovery of an unapproved track bar on Bowyer’s Toyota during opening-day inspection September 18th.

Components that allow movement of certain track-bar joints or mounting bolts are forbidden. Permitting those rear-end suspension components to move would allow the car to handle better in the corners. Bowyer and car owner Rob Kauffman were each docked twenty-five championship points.

Crew chief Billy Scott was fined seventy-five thousand dollars, suspended for the next three races and placed on probation for six months. M-W-R said it would appeal the penalties.

The right-side quarter panel behind the rear wheel on Danica Patrick’s Number-10 Stewart-Haas Racing Chevrolet was modified during pre-qualifying inspection September 18th. Crew chief Daniel Knost and car chief Pete White were both placed on NASCAR probation through December 31st