Im an Xa guy but yeah found this site with t-shirts for the Xb. Looks pretty cool and you get 25% off the price of the shirts when you use coupon code Speedoptions.

http://www.autotooner.com/inc/pdetail?v=1&pid=2144

http://www.autotooner.com/home

http://speedoptions.com/articles/4297/

whoa.. great find. the xb looks so funnee.. lolz.

nice shirts, but the blue is too bright. Ours is a little darker. 8)