by: George Achorn This past weekend was the Macau Grand Prix, a race of GT3 cars such as the Audi R8 LMS that takes place on one of the world's tightest circuits on any racing calendar, though in this case on the FIA GT World Cup. As you might expect, the race provided plenty of thrilling moments, including one of the most expensive pile-ups of racecars we think we've seen in a very long time. https://www.youtube.com/watch?v=Y1n8F4uClUU In the first situation, there was no Audi at fau...