The 2-11 was sold in the U.S. in limited numbers, (34 total the first year, 2008), and as such they would have had to crash more than they were planning on selling to meet homolgation requirements. The car is sold in the U.S. as track only and owners have to sign affidavits stating the car will not be run on the street.
The U.S. spec cars have no front lights, horns, and are set up with a track suspension which is something you would not want to drive on the street, believe me on that one.
The 2-11 is based on the Elise/Exige model but uses the older S1 frame as it is stiffer and has higher side rails. The car initially was introduced with a supercharged Toyota 2ZZ motor but later came out with a base, non-supercharged version. 2011 is the last year for purchase of the 2-11.