The problem I have is 18 months ago I did 2000 miles in 3 days on my other xt660 with aftermarket cans on. By the 3 day I was in big trouble. Long story short my ears are now fecked the wind even does me in now after 30 mins so I have to keep quiet exhausts on and use ear plugs , and trust me it pissis me off as always have aftermarket cans. Lucky for me my fz1 and my tiger 800 one has arrow and other has akrapovic exhaust on but with the baffle in them ,they are just about ok. I am looking for a new lid to help with the noise. So was hoping to do all the mods just not change the cans. But if there is no point doing the mods without changing the cans I will,just have to leave it or put aftermarket cans on and hope my ear plugs work