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Originally Posted by GorillaRE
Have you ever really listened to a loud un-muffled rotary idle? Do you know how the idle seems to be fairly smooth/consistent and then all of a sudden not? e.g. brrrrrrrrrruh........brrrrrrrrrrrrruh........brrrr rrrrrrrruh.........breeehhhrrruuh etc.
That is the sound of too much exhaust pollution. It builds up and builds up and builds up, then breeehhhrrruuh.
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an a-ha moment for me! thank you.
