Not a Merc but still quite something special and rare. It must shift with all that power:
http://cgi.ebay.co.uk/RS200-RS-200-FORD-GROUP-B-SUPERCAR-WRC_W0QQitemZ330247579448QQcmdZViewItem?hash=item330247579448&_trkparms=39%3A1%7C65%3A3&_trksid=p3286.c0.m14