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They are both rated for up to 30lbs of boost. Both are self-contained oil units. I talk to pro-charger before I bought my kit for my cobra, they said if you have a pretty much stock motor go with the p-1sc. If your engine is in the 400 - 500 hp range already to go with the D-1sc. Thats what they told me anyway. There is only a 300$ difference between the two.