BILL AUBERLEN: Well, there's a simple reason for it. I've been contracted to the BMW factory, whether it be BMW AG or BMW North America, for the last 10 and a half years. Every time I renegotiate my contract for the next year, it says, 'Here is what we want you to drive, here is what we don't want you to drive.' When I say 'Daytona Prototype,' they say, 'If we you want to do it, we want you in with a BMW motor.' They make that the stipulation.