WhatClassAmIAutocross Classing Guide

SCCA® Solo classing — unofficial guide

What autocross class is a Audi S4 (B8/B9)?

DSStreetBSTStreet Touring

A stock 2010–2026 Audi S4 (B8/B9) 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: 'S4 (2010-26)' = DS. ST: 'S4' = 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.