I don't think you'll find a better muffler than the OEM one. Those pepperpot mufflers are not very quiet. That could have been your 'knocking' noise, but the only way to know for sure is run it with a different muffler on and see if the noise is gone.
Before you put that epay sediment bowl on, order a KOHLER bowl gasket for it. Those aftermarket bowls are made in Asia somewhere and the bowl gaskets don't seal at all. I don't think they're the right material.
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