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Assuming you are looking at the difference in and SC and a Carrera.
The entire car, or just an engine? The major difference, besides the obvious displacement is the type of fuel injection. The Carrera's DME is a much more modern system that the CIS of the 3.0 engine. Neither is perfect, but the DME allows for software mapping to customize the setting to match any changes in the engine.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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