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911 1980 SC muffler 3.0

Engine

Model: SC 3.0, Year:1980, Mileage:120,00, Type of use:Street use only
Can a second exhaust outlet be cut into a stock muffler without destroying its sound to a large degree? I am considering having a muffler shop cut a hole and add a second pipe. Will this destroy the effect of the muffler?

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