SCCA® Solo classing — unofficial guide
What autocross class is a Ford Mustang Shelby GT350R?
SSStreetESPStreet Prepared
A stock 2015–2020 Ford Mustang Shelby GT350R runs in SS (Street) under the 2026 SCCA Solo Rules.
Class by preparation level
| Stock (Street) | SS |
| Street Touring | — |
| 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 Shelby GT350R (2015-20)' = SS. SP: 'Mustang Shelby GT350/GT350R (S550) (2015-2020) Limited Prep' = ESP.
Other SS 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.