Tested car was equipped with Pirelli Corsa (i.e. sport tires) which are not available as an option to customers. The car still had the speed limit of 259kph installed (The question is why? If they even mounted tires which cannot be ordered as OEM equipment...)
Hockenheim (with Corsa tires): 1:14,4
Hockenheim (with regular tires): 1:15,9
NBR (with Corsa tires, regular time not available): 8:09
0-200 kph: 12.8 secs (seems they selected the tested car properly...)
sportauto claims that the M6 with regular tires but without the 259kph-limit would probably do around 8:09 on the NBR as well.
more cars tested by Sportauto, Hockenheim
1:12.7 --- 128.748 km/h ? feRari F430, 490 PS/1493 kg (sport auto 12/05)
1:14.1 --- 126.316 km/h ? Ford GT40, 550 PS/1599 kg (sport auto 12/05)
1:14.4 --- 125.806 km/h - BMW M6, 507 PS (sport auto 12/2005)
1:15.4 --- 124.125 km/h ? Caterham CSR200, 200 PS/630 kg (sport auto 12/05)
1:16.4 --- 122.513 km/h ? RMS-Mini Cooper S, 270 PS/1191 kh (sport auto 12/05)
1:16.5 --- 122.353 km/h ? Abt AS4-R, 480 PS/1780 kg (sport auto 12/05)
1:16.9 --- 121.717 km/h ? Sportec Porsche Boxster SP370, 370 PS/1431 kg (sport auto 12/05)
1:21.0 --- 115.556 km/h - Mini Cooper S John Cooper Works, 210 PS/1240 kg (sport auto 12/05)
1:21.8 --- 114.425 km/h ? Mazda MX-5 Expression 2.0l MZR, 160 PS/1140 kg (sport auto 12/05)