there is a sleeve that has to go on the header pipes that transistions the header to fit harley pipes and andyb here on this forum has done it i heard a video of his bike when he did it it sounded good to me ....and the look on andys face ...it was obvious he like it and the effort to do it was all good ...its by no means a plug and go ...i think andy sleeve peice he use was turn up a bit to get the pipes where he like them and im sure he had to mod the rear muffler mount some to get it to work ....hes had it that way a long time now :mrgreen: