sweet, but the only way to really compare the pipes is to have your cylinders ported to match. if your hjr port is for t5's then you arent gonna get the best results when you throw on a different set of pipes. it'll give a nice idea of what to expect, but wont be completely accurate. it'll still be cool to see what happens though, especially when i was thinkin about goin shearer or cpi on my bike.