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Here's an overhead comparison of the new MSS manifold (left) and the old European-spec two-barrel manifold. As you can see, both have roughly the same size inlet for air from the carburetor. But look at the passages that run from the inlet to the cylinder-head ports. The standard manifold's passages make several sharp turns, while the MSS manifold gives the mixture a nearly straight path to each port. That's the secret of the MSS manifold's better mixture distribution.