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1980 911 SC exhaust loudness

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Vehicle Information: Model: 911 SC; Year: 1980; Body Type: Coupe; Total Mileage: 80000;

Last year I had SSI heat exchangers and a non-stainless steel Dansk exhaust installed. I find the Dansk to be loud in enclosed spaces such as the garage building (car alarms go off as I drive by). My neighbors have commented on the loudness of the exhaust especially during the winter when I have the car run at idle for while until it warms up. The muffler also has a resonance note that I do not like. There are no holes in the muffler and it sill looks brand new. I wonder if I could use a 1973 or earlier stock muffler. would such a muffler be quieter? would it significantly affect the increase in power that I have enjoyed since the SSI conversion?

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