I am on my second hare scramble with my WR450F and 230 miles. The first race had no rocks but some small cut sapplings on the trail. After the race I noticed three good sized dings in the header pipe. I just completed my second race and the pipe is more than 50% crushed in one spot and I did not crash. Question 1) Does anyone believe that these header pipes can be repaired like they repair 2 stroke expansion chambers? Question 2) Does anyone know of any good header pipe guard or protector?