More info
The SN42S allows for the use of the larger 240mm RWD SR20DET clutch kit in addition to the 228mm KA kit.
Torque specifications (in pounds) for each stage
Stage 1 : 265 lbs
Stage 2 : 300 lbs
Stage 2+ : 325 lbs
Stage 3 : 380 lbs
Stage 3+ : 485 lbs
Stage 4 : 380 lbs
Stage 5 : 550 lbs