What is a "touring car?"

[Matt93SE]

ST warts and all? Don't you mean IT?

Nope... June 2014 GCR: (emphasis mine)

9.1.4.A. Purpose and Philosophy
The intent of the Super Touring category is to allow competition of
production-based vehicles, at a higher level of preparation, using DOTapproved
tires. Vehicles used in this category must be identifiable with
the vehicles offered for sale to the public and available through the
manufacturer’s distribution channels in the US. No chassis or engines
older than 1985 will be eligible, except that model runs that began
before 1985 are eligible (e.g., if a model was produced in 1983-1988,
the 1983 and 1984 cars are eligible). The SCCA does not guarantee the
competitiveness of any car.

Super Touring Under (STU) vehicles are mid-level multi-purpose
performance cars of 3.2 liters and under...
...Spec lines are not required for STU
eligibility; unless otherwise specified, any vehicle meeting the model year
and engine displacement limits is eligible for this class.

It seems that too many people are forgetting the competitiveness guarantee.

Maybe the formula needs to be adjusted slightly, (how about RWD McStrut cars have a smaller weight penalty than RWD double-wishbone? ) but I'm certainly not in favor of a Prod/GT-level spec where this car gets brakes and that car gets bigger restrictor.

Give everyone the same prep rules and let the cards fall where they may. I chose my car knowing it's NOT a Miata or a Solstice, and I'm gonna race it anyway, heavy iron engine, McStruts and all.