WhatClassAmIAutocross Classing Guide

SCCA® Solo classing — unofficial guide

What autocross class is a Ford Mustang Mach 1?

FSStreetBSTStreet Touring

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.

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.

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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.