Do you think this is because they think HMF is the best or is it that HMF paid the most for them to use on their bikes?? Celebrity backing, especially in racing, really doesn't mean much at all. If Campbell's Soup gave each of them $1,000,000 to use one of their soup cans as a muffler I bet they BOTH would do it.
and if i was going to spend the money to begin with to buy some pipes.... that .5hp gain compared to something else that costs the same with -.5hp ... well id get the additional .5hp ... i mean really ..why else do you want to put exhaust on a quad?
Im gonna put this pipe on my quad so i can lose .5 hp heh.