https://cny-scca.com/solo/rules.php
Old data, but decent for starters I hope.
Go to Classing Guidelines in the middle of the 2nd paragraph.
This is just a summarized list, but it sounds like more than you've found so far. The safest bet is to read the complete SCCA rule set.
The wing and lip sound like they bounce you far from where your actual performance will be. You're not street (aka stock) and even Street Touring doesn't allow for wings and spliters unless they were available from the dealer/Toyota as common options from a non-TRD catalog for that year. Best guess is C Street Prepared, but don't quote me on that.