a stock 240sx? I may have to see that for myself, I didn't think they existed anymore.
It's STC by the way. No class hopping in ST so stock VLSD or nothing.
I agree with Motoring, try it first and get used to the events and the classes and then build the car to the class you want to run in. That being said, the car seems to get the most play in SM. But be careful on that decision, they don't call it $M for nothing. If I had to start from a clean slate I would probably try to stay in ST, though I enjoy the car with a lightweight flywheel and HLSD too much to go back.