I've never run BW backwards. Took me a minute to figure it out when they left the grid. It really shows how ratty that track actually is although the grounds are coming along beautifully!
The C6 is a Z51 base, but pretty heavily modified, both engine and especially suspension and stick tires. I think he's up around 460 WHP (well beyond base ZO6). It's a beast. I mean was a beast. He blowed up there at the end and I think will building a 402 next. Eventually he's going to make this a dedicated race only car.