My estimates say 205 Crank HP at the current weight. ( cars cannot get lighter)will bring them into the current ITS window. I think I can get 195. The big issue for the S14 is the poor camshaft selection. While these are sporty cars they have a truck motor in them. Again I am not trying to move the car.
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Without getting into too much detail and stepping on any toes, I can tell you 205 crank HP in a S13 motor is very attainable in fully legal ITS trim.
One just needs to drop the money to the proper engine builder.