you don't need new suspension and wheels or anything else to get into autocross. In fact, *the* best way to learn is in a bone stock car. Learn to drive what you have first before upgrading.

Plus, quite often the mods that people do to their cars will put them in a really uncompetitive class. But, tbh, our cars even in H stock get eaten alive by Mini Coopers. All the aftermarket equipment will do is change the learning curve by making it a lot higher.

Learning to drive something that is slow forces one to maximize momentum. Once a driver really learns that concept, then as the car's capabilities are increased the driver will be better able to take advantage of the car.