SCCA® Solo classing — unofficial guide
What autocross class is a Ford Mustang Mach 1?
FSStreetBSTStreet TouringESPStreet Prepared
A stock 2021–2023 Ford Mustang Mach 1 runs in FS (Street) under the 2026 SCCA Solo Rules. Built to Street Touring allowances (within BST tire and wheel limits), it runs BST.
Class by preparation level
| Stock (Street) | FS |
| Street Touring | BST |
| Street Prepared | ESP |
| Street Modified | SM |
| Prepared | — |
A “—” means the car isn’t listed at that level; a build lands in the least-prepared category its modifications allow.
Also eligible for
CAM-CClassic American Muscle
From the 2026 rulebook (Appendix A)
Street: 'Mustang Mach 1 (all) (2021-23)' = FS. ST: 'Mustang GT (excl. Shelby versions & Boss 302) (2005-23)' = BST. SP: 'Mach 1 (2021-23)' = ESP.
Other FS cars
Unofficial guidance verified against the 2026 SCCA® Solo® Rules — always confirm against the current rulebook before competing. Classing data cites the exact Appendix A wording it relies on. Spot an error? Report it on GitHub.