Are you allowed to remove the rear seat for competition in Auto-X STS class? I remember reading something where you wern’t allowed to remove them in cars that came with them, but I can’t find where I first read that. I competed for the first time today, and I say folks removing their rear seats.
Not in STS. Check http://www.scca.com for the official SOLO rulebook, and check http://www.sccaforums.com for more SCCA related information. Hope that helps.