I have a 2005/2006 WR450f which I have owned from new. In total the bike has only covered just over 2000km. I originally used the bike for enduro's which resulted in the usual abuse and when I identified that a hole had been blown in the side of the silencer, I did't think much about it. Recently I decided to convert the bike to supermoto and as part of the conversion I had a new full system fitted as well as rejetted and dyno'd. I just recevieved the bike back today and took it for a run for about 30 mins. Half way through the run the exhaust became very loud and on returning home I found that the silencer had been blown apart. Has anyone come across a similar problem as I'm at a loss as to the cause.