[humboldt1498]

Originally Posted by CanyonDriver

STS does not allow any internal modifications in the motor or tranny.
Straight from the SCCA Classing Guide:

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STS consists of sedans/coupes with four seats minimum and normally aspirated
engines up to 3.1L (very few turbo/supercharged cars are allowed).
Stock category allowances
No limited slip differentials except for standard viscous-types
Pedal kits and other interior trim
Front seats (15 pounds minimum weight each)
Rub strips, emblems, and mud flaps removed


Body kits, spoilers, and wings added
Tires up to 225 mm wide, UTQG treadwear 140 minimum
Wheels up to 71⁄2 inches wide, any diameter/offset
Shocks/struts
Drilled/slotted rotors (standard size) and braided DOT brake lines
Anti-roll bars, front and rear
Lowered suspensions using standard-type springs
Suspension bushings (non-metallic)
Camber kits, plates, or bolts
Traction bars, torque arms, panhard rods
Strut bars, 2-point only
Battery relocated
Air filter systems up to throttle body or compressor inlet
Headers, emissions compliant
Engine computers (PCM/ECU) reprogrammed
Shifter kits
Accessory drive pulleys
Motor mounts (non-metallic)
Example of included cars: Audi A4 1.8T and TT (non-quattro), Mazda 323 GT
and GTX (AWD), Volkswagen Golf/GTi/Jetta/Beetle/Passat 1.8T and TDI,
Volvo S40 (except T5) and V40
Example of excluded cars: Datsun Z 2+2, Honda CRX, MGB GT, Porsche
(all), Triumph (all)

In the stock rules it says a .020 over bore is OK...Im confused