My lease is up in a month on my 2008 X3. The 2010 XT is at the top of my list for my next vehicle. I read the "how to turn better than an STI" thread above but it seems that is for the last body style. How much would putting better tires on a 2010 help? I live in L.A. so I don't even know if they come with four season tires or if because there is no snow here, the tires are already better. Thanks for indulging me.