Hope this is the right place, I dont post in forums much
I suggest that having a car in the same class as your racing skill could count as an enhancer/perk for crimes. This would work by giving increased rates of "No jail/hospital" results when a crime fails. This means it is not increasing success rates, but increasing your chance to escape. The bonus can look like "Class D = 5% increase in avoiding jail or hospital when a crime fails" with the other classes offering a higher % bonus as you become a better driver.
Logically a class A licensed driver with a super-car get away vehicle would have better chance at not getting caught when poo hits the fan instead of someone on foot or in their mums minivan with more driving experience at the golf course than on the road.