I've recently noticed a cricket sound in my ears and asked people around me if they hear crickets and they all say no. I started reading up on this and found a large population of people have this and it can be caused by high decibel noises such as a chainsaw. I rebuild a lot of chainsaws and run them nearly every day and seldom use ear protection so I think I know where mine came from (there are other causes as well). I thought I'd just offer some of you muffler modders, like me a little advice that you might want to think it through about the mods and about hearing protection.