The SCCA 2002 Solo rulebook has this to say about STS:
Quote:
Vehicles eligible for this category include all coupes/sedans with a minimum of four seats, four seatbelts; that are non-sports car based with a maximum engine displacement of 3.1 liters, normally aspirated and certain small displacement turbocharged sedans.
They go on to specifically list the 1.8T as an eligible vehicle as is the Audi TT.

The key point is nobody's pitting any turbo Subaru against a Contour in STS, not the rules, and not the scorekeepers in this region.

Pacific Green '96 Contour LX V6, loaded
'98 Grand Prix GTP 14.88/91 bone stock, awaiting new times from 3.4 pulley, CAI, U-bend removal but it's creeping up on the...
Calypso Green '92 Mustang LX coupe, 13.56/101

3-time local class champion autocrosser

Racing school whore