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Heating and Ventilation

Vehicle Information: Model: Carrera; Year: 1985; Body Type: Convertible; Engine (type, size, modifications): 3.2; Total Mileage: 47,000;

I was reading past questions and someone asked about SSI vs. headers. My question is what is SSI? I am also trying to decide on free flow exhaust for my car. I have noticed a stock style exhaust that they sell that is more free flowing, do you know if they are any good? I like the stock look but would like dual outlets. what do you suggest? I recently purchased a cat by-pass pipe will this help any? Thank you for the help!

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