[color=rgb(74, 74, 74)][YouTube:uW2AIwk5ZAw][/color]
Please take a look at the video (or listen). It started sounding a bit strange - sort of tinny, higher pitched (hard to describe). I haven't noticed any other symptoms. I've recently done a service including new plugs - the noise was there before and after.
I did notice a tiny bit of exhaust leaking from a rusty seam between the pipe and muffler - could this sound be linked to that? I expected it to be a bit more throaty if it was (this is more nasal???)