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I take your point about intake length but the issue of turbulence before the trumpet is a valid one. If you look at EFI inlet plenums the airflow into the plenum box is as smooth as possible so that the intake runners can get the cleanest flow possible. The classic aircooled box bolted ontop of the carb, within which the trumpets sit and where the intake air is a pipe fixed on the side of the airbox just looks all wrong from a clean airfow point of view. With open stacks at least the effective plenum is the engine bay so the carbs can expect a reasonable laminar flow. Put a can around the stack with only a single entry point that is usually below and to the side of the stacks and you cann see that the air has got to be pretty mixed up before it gets to the entry point of the stack.
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