SCCA® Solo classing — unofficial guide
What autocross class is a Porsche 718 Boxster & Cayman (base/T/S/GTS)?
ASStreetSSTStreet Touring
A stock 2017–2025 Porsche 718 Boxster & Cayman (base/T/S/GTS) runs in AS (Street) under the 2026 SCCA Solo Rules. Built to Street Touring allowances (within SST tire and wheel limits), it runs SST.
From the 2026 rulebook (Appendix A)
Street: '718 Boxster (base, T, S, GTS) (2017-25)' / '718 Cayman (base, T, S, GTS) (2017-25)' = AS. ST: '718 base & T (2017-22)' and 'S & GTS (excl 4.0L) (2017-2024)' = SST. GTS 4.0/Spyder/GT4 = SS.
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.