No in racing, your car is used on a track which is usually prepped with little o no gravel or foreign objects. When you bash, most lkely on the street or backyard, all types of materials are there. I had a rock lodge in between my CB and chassis grinding out a piece of it, just by running it on the side of the track in the grass and dirt. I don't do it anymore more, becuase I find more things lodged in the car from doing that than on the track.