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The Z4 35i/iS and the 335iS share the same intercooler and the Z4 35i/iS both have factory oil coolers. I have no idea if the 335iS oil cooler is any better but based on parts diagrams they mount to the frame and connect to the hoses differently so it won't be a direct swap anyway. I have no idea if the radiator fan interchanges either but for what it's worth the image in the parts catalog is identical.
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