Please see below for the most recent updates for Club Spec Mustang (CSM), with changes indicated in red. All changes have also been incorporated into the rulesets online here.

Eligible Vehicles

2005-2009 Ford Mustang GT Coupe, Convertible (S197 Chassis)
Including California Special, Shelby GT*, and Bullitt* models

*Must use engine and and rear gear ratio listed below and either complete OE suspension or Performance Kit suspension

Required Performance Kit

A. Parts specified below (tires, wheels, and suspension) must be used. All components and parts (e.g., hardware) are required to be installed per manufacturer instructions. Original equipment (OE) or equivalent components are not allowed. Note: Ford Racing M-5300-K springs and M-5490-A sway bars may be used/retained on factory built and serialized Shelby GT models.

Authorized Changes/Modifications

Bodywork/Interior

B. Factory installed dress up items, such as hood scoops, spoilers, and side vents may be removed, added, or substituted, including the usage of replica items that are identical in design to the OE options.

C. Factory option or aftermarket grills may be utilized, provided the replacement has the same function and mounting locations as the original.