What Do Those Switches On The McLaren MP4-12C GT3's Steering Wheel Do?

Nine McLaren MP4-12C GT3 racecars (in six customer-team liveries, including the classic powder-blue-and-marigold Gulf) are competing this weekend at the Belgian bucket-list confab, Spa24. How does the GT3 differ from the road car — and what it's like to drive in an endurance race? Let's query driver Rob Bell. » 7/27/12 6:00pm 7/27/12 6:00pm