yeah i had the full m4 system on my 1000 and you ditched the stock gaskets and they gave you some spigots with big o-rings that melt away because my buddy had same system on his gixxer 1000 and we took his exhaust off when he put turbo on and two of the four o-rings were gone......i was like WTF BUT whatever,sounded good and made good power and looked good.