My Dan moto slip on is pretty loud, even with the decibel killer and being that I leave for work around 4 am I have been looking for a way to quieten it down a bit. After looking at different types of decibel killers I thought i'd try something simple, a 50mm washer. It's a perfect fit in between the header reducer and the slip on and reduces the sound level but still sounds good. Currently have a 14mm hole thru the washer, tried 20mm but was to loud, original 10mm hole is real quite. Cheap, easy to do and easily reversible.
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