Um... the cars do have mudflaps - and penalties are handed out if they are not present! They do not apparently have any effect on the loose gravel though.Just a random thought I had. Forgive me if it's obvious, if there is a rule about it or if it was done before. I'm newish to rallying.
Here it goes, on all events (except for tarmac) the first driver is always at a disadvantage as he has to "sweep" the road. His tires grab the sand, stones, snow or whatever, and throw them aside making a cleaner and faster line for the driver coming after him. Now, if the first driver (or all drivers) were to have mud flaps on his car, the dirt thrown out by the tire would hit the mud flap and fall right back down onto the line the car has taken. Therefore, the car coming after would no longer have the advantage.
Why isn't this done?
Spot the flaps!