If you prep it as a fully-compliant ITS car, you run ITS weight.

If you deviate in any way toward STL prep, the 13B weighs 2589, plus you have to add 5.5% for rear wheel drive.

No porting.

"Alternate flywheels are permitted. Flywheel material shall be ferrous or aluminum and the ring gear diameter must be the same as the OEM flywheel."

"Any clutch disc and pressure plate of OEM diameter may be used. Carbon clutch components are prohibited."