The assembly kit is included together with all the components necessary for the replacement of the spare part. No modification of the fittings is required. .
I have a black XR this exhaust compliments the look of the bike so much better than the OE exhaust. Its lighter and it sounds great. Easy to install, full fitting instructions are included. If I was being picky the shape of the carbon fibre cover doesn't exactly match the shape of the can at the front edge. But I would definitely recommend Arrow.