See this http://1000rr.co.uk/maintenance/19484.htm Where I described how my can seemed to have got noisier and maybe I should have it re packed, or had a hole where it was blowing somewhere. I have solved the problem. At the time I had a small cut just on the inside of my ear so I wasn't wearing my usual acs earplugs for commuting, these, . No, I was wearing these, Oxfords finest mushy sponge. Put the acs ones back in today without thinking because the cut has healed, and hey presto, my exhaust is fixed!!!