What kind of BMW is this?

a href="http://images.search.yahoo.com/images/view?back=http%3A%2F%2Fimages.search.yahoo.com%2Fsearch%2Fimages%3F_adv_prop%3Dimage%26va%3Dbmw%26fr%3Dmoz2&w=1024&h=768&imgurl=www.allsportauto.com%2Fphotoautre5%2Fbmw%2Fnasca_c2%2F1991_bmw_nasca_27_sb.jpg&rurl=http%3A%2F%2Fwww.wordswarp.com%2FBMW.html&size=89k&name=1991+bmw+nasca+2...&p=bmw&oid=adc8f8cca6813ed4&fr2=&no=1&tt=15851898&sigr=111j0ir85&sigi=126ltjust&sigb=12b55sjcp"http://images.search.yahoo.com/images/vi…/a