Hi, all 2018 Cummins deleted with MM3.
Did all the work myself.
I thought the pretty loud whistle/hiss was because it was straight piped, so I bought a muffler.
Still too loud, so I bought a much more restrictive muffler and fired it up last night, and it’s quieter except for the whistling hiss is the same.
Can I smooth this out and quiet it up somehow, maybe with my tune?
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