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Change Log

Version 2.0 — September 28, 2026

Minimum vehicle weight increased from 2,750 lb to 2,775 lb.
Minimum wheel weight increased from 14 lb to 15 lb.
Sway bar end links are now unrestricted when using factory mounting locations; adjustable end links, spherical rod ends, and polyurethane bushings are permitted.
The suspension-bushing rule now expressly excepts permitted sway bar end-link bushings and spherical rod ends.
OEM Performance Package Brembo calipers must be used as a complete four-corner system. Aftermarket 4-piston front calipers may still be paired with OEM sliding rear calipers.
Four-corner OEM Brembo cars may use one-piece replacement rotors matching factory dimensions; two-piece rotors are prohibited.
The Wilwood 6R / 6-piston exception, 328 mm rotor allowance, and associated 18 lb wheel-weight penalty have been removed. Calipers with more than four pistons are now prohibited.