SCCA® Solo classing — unofficial guide
What autocross class is a BMW 3 Series (F30/F31/F34, 4-cyl turbo)?
DSStreetBSTStreet Touring
A stock 2012–2020 BMW 3 Series (F30/F31/F34, 4-cyl turbo) runs in DS (Street) under the 2026 SCCA Solo Rules. Built to Street Touring allowances (within BST tire and wheel limits), it runs BST.
From the 2026 rulebook (Appendix A)
Street: '3 Series (328i, 328d, 330i) (4-cyl turbo; F30/F31/F34) (2012-20)' = DS. ST: '3 Series Turbo (Non-M) (2007-26)' = BST.
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.