I think the bumper actually helps keep the body from trashing out. My Jammin just tears out the rear end of the bodies so fast cause it flexes enough to contact the rear wheel. I always expect the rear end to tatter fairly fast. The SC10 never had so much issue for me.

I like the mud flaps too. I don't plan to cut my rear bumper so I can add the mud flaps back in for the next race!