[jh_f30]

It's not just the power in an M3 that makes it easier to kick the tail out. Suspension setup and LSD play a big role. If your car is stock, it's designed to NOT be tail-happy. Most mass market cars are designed for the lowest common denominator in driver skill; base model BMWs are no different. You can make it easier to get oversteer with some changes in setup. Stock open diff does us no favors, but installing an LSD might be cost-prohibitive. Crappy, low grip econo tires will break loose more easily, but you'll suffer consequences in daily driving.

Increasing driver skill is going to be the best "mod" you can do. Proper instruction in a closed, controlled environment will help towards getting you familiar with the limits of your car and how to handle it when you push past those limits. And as others have alluded to, pushing past the limits on public roads is at best irresponsible and most likely illegal, at worst dangerous to you and others you share the road with.