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Vehicle Information: Model: 911S; Year: 1973; Body Type: Coupe; Engine (type, size, modifications): 2.7 RS spec; Total Mileage: 113000;

I need some clarification on "rally" mufflers. I'm seeing 2 types. One where the 2 exhaust outlets straight back are capped with the side open. One with the side outlet capped and the others open. What's the difference? Are they both Porsche racing?

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