Whats up fellas I want to remove the stock exhaust system off my 750 gsxr. I ve looked at hmf underbody exhaust, are they good? Im just going to replace the slip on pipe from the headerpipes back, Im curious I know I will get alot of power just removing the cat. Does the hmf pipe make around the same power as the yoshe pipe, my current pipe is only about 8 inches. We are talking breathability are the two comparable or is it a big diffrence between the two has anyone changed their cats out yet? If so what do I need to watch? thanks guys...chris 
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