Take an extra set of fenders and laminate foam to the underside. Spray some contact cement on both surfaces, allow to set, and work it in, trim off the extra? And you better believe that photo looks like 1 got a LOT muddier! That guy seemingly does not like mud? I did not stay long enough to see a price. The mud riders have put such things on their helmets and in between the skid plate and engine for quite a while. But, how many times has the wheel rubbed your fender? Properly set suspension, it should bottom on the roughest part of the track. BYE BYE Foam, or poly urethane?