The stock one is the quietest. To my knowledge, all aftermarket "silencers" (we'll use the term very loosely) are louder than stock. Some of them significantly so. In fact, I don't know of any motorcycle where the factory exhaust is not the quietest option.
The stock KLR muffler is very heavy, though, which annoys some people to an unreasonable degree.
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The stock one is the quietest. To my knowledge, all aftermarket "silencers" (we'll use the term very loosely) are louder than stock. Some of them significantly so. In fact, I don't know of any motorcycle where the factory exhaust is not the quietest option.
The stock KLR muffler is very heavy, though, which annoys some people to an unreasonable degree.
I don't mind the extra few pounds. The bike's already a heavy pig 🐷
I'm gonna have to keep an eye out for a used stock muffler