WhatClassAmIAutocross Classing Guide

SCCA® Solo classing — unofficial guide

What autocross class is a Subaru WRX STI?

DSStreetBSTStreet TouringSSPStreet Prepared

A stock 2004–2018 Subaru WRX STI 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: 'WRX STI (including Special Edition) (2004-18)' = DS; 'STI (excl. S209) (2019-21)' also DS; Type RA (2018) = BS. ST: 'Impreza WRX STI' = BST. SP: 'Impreza WRX (incl. STI) (2002-14)' + later listing (excl. Type RA & 2019 STI) = SSP.

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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.