Loud pipes
Basicly you have to change sound energy to heat. The more metal or baffles you get in the stream of exhaust and sound waves coming out of your head pipe the quieter it will be. if you just keep taking out discs you will also reduce power and upset the running. Build a slip over cover for the discs and extend it a bit to the rear and make more muffler behind, then exhaust the noise down.
I have done this several times with loud pipes on street bikes and it does work.
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