[Twix]

Honestly, a good option for auto crossing would be a Miata. You can buy them cheap, parts are cheap and they're really good for doing stuff like auto crossing.

Auto crossing is very hard on your car, especially the brakes as you'll be buried on both pedals at the same time quite often.

The X1 is a poor choice because of it's weight, and the 28i with xDrive won't be much fun, You can turn off the nannies, except the xDrive system is so intrusive that you'll never really get to the potential of the car without becoming frustrated with it. There are guys here that track their X1's with success, but I think auto xing would be too much for the heft of the X1 and it's tiny brakes.

My opinion, get a Miata and throw decent suspension and tires on it and get a roll bar. Use the X1 as a daily, it's never going to worth anything so you may as well enjoy it instead of buying a beater for daily use.