I think they were aiming for the best time and used the best tires on hand to achieve this. You cant ask for much given you have a guy who literally owns Streets of Willow and Mazda Laguna Seca doing the driving. The 328i is not going to lap faster than the Mustang V6 in the best case scenario for both cars. A 1:30.7 time is not bad though. The Stang V6 has a record of 1:29.09 at SOW
http://fastestlaps.com/tracks/willow...of_willow.html
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