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(I dont know where this should go: The intake manifold typically runs from the plenum to the cylinder heads / air intake ports on the engine. It's design can be adjusted to increase performance using the tuning methods below. The manifold also contains ports for the fuel injectors. (i think this is a great place for it, maybe a section about intake structure above this to clear up all the terminology? -simon)

Maybe make an intake system terminology section? I agree though, probably better to have more than less information