SCCA® Solo classing — unofficial guide
What autocross class is a Porsche Boxster & Cayman (981 base)?
BSStreetBSTStreet Touring
A stock 2013–2016 Porsche Boxster & Cayman (981 base) runs in BS (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) | BS |
| Street Touring | BST |
| Street Prepared | — |
| Street Modified | SSM |
| Prepared | — |
A “—” means the car isn’t listed at that level; a build lands in the least-prepared category its modifications allow.
From the 2026 rulebook (Appendix A)
Street: 'Boxster (981 base) (2013-16)' / 'Cayman (981 base) (2013-16)' = BS. ST: 'Boxster/Cayman (987.2 & 981.1) (2009-16)' = BST.
Other BS 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.