I'm curious, assuming this would indeed alow more air, why would it not alow more power? With more air, you could then increase the fuel delivery accordingly and that increase in fuel/air should yield more power. Now weather it's enough to make it worth the work is another story.
I'd lean towards swapping the turbo 5 in there. The power difference between my normally aspirated 79 300D and the '82 Turbo SD is quite large. The SD even being a larger car is much faster.
Frank.
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'82 300SD
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