The best advice I can give you, after owning the same bike for a long long time is to change the packing on your canister very very frequently and another thing is one single pack of the stuff isn't good enough, you need to buy two (FMF or Moose). You need to pack it as tight as possible so that you can barely slip it back into the can itself. Not only will that quiet the bike down substantialy but it will also improve your bottom/mid response as well, obviously a cr500 allready has tons but you will notice a vast improvement. Hope this helps you.
The db snorkel is interesting. The company sent us a free system last year to try on the 125 bikes. Graham Buck was working with it and it seemed to shave a few db. Might be worth getting a hold of Graham and asking him about it as he's spent time with it on a dyno with a sound meter. Otherwise, long silencer with good packing. Paul would probably know what sort of readings he was getting a few years ago.
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