Just putting this out there: I was playing with my brother just now, and we played a 2-lap race called Shore Up, in Sandy Shores, I think it is a new one from the Beach Bum DLC. Anyway, at the end of my first lap, I got a giant bar of RP added. My brother said he got a message that I set a world record at the same time, so it might be a fluke. He says he didn't get anything, but I don't think he was paying attention.
We replayed it immediately, and I got the same giant bar of RP at the end of lap 1. It certainly seems like the kind of RP Criminal Records gave, but I'm not sure. It was enough to fill up my bar one third of the way, and I'm at level 94. The race itself is kind of long, taking bout 3 minutes for two laps.