I have not driven a cummins powered 400SB and I am very happy with the cats. From my research before buying it seems the cummins have a bit more power but the cats run more efficient. The previous owner put larger props for better handling around the docks and left me the factory ones in the engine room. I am going to change them over the winter and see the difference next season. Cruising speed now is about 20mph at 2300rpm. I'm on Lake Ontario which can get rough and the cats just plough through with ease and never fall off plane.
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