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A glimpse inside the plenum of the B1 intake manifold reveals extensive modifications. Note the epoxy filling of the floor, the porting, and the runner extensions welded and blended from the runner branches. Why are they there? According to Brenda, who performed the work: "The runner extension was one of the things we looked at and thought maybe we can get a little better signal to the carburetor--that sort of thing, with those extensions in there."