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Message: <blockquote data-quote="Powerzone" data-source="post: 566312" data-attributes="member: 9157">The custom intake manifold that we make have larger plenum chambers that are at least 80% the volume of the engine cc. So, if you have a 1.5 liter engine, a 1.2 liter plenum chamber is made for it. This is to ensure sufficient air reserve when the throttle is suddenly cracked wide open.Whether your engine needs this is dependent on its volumetric efficiency (V.E.). Most standard engines have rather low V.E., maybe about 70-80%, and so will not benefit from a larger plenum chamber.Our custom manifold also features the proven bell-mouth installation. Every individual intake track at the plenum chamber has its own bell-mouth. This helps to gather more air and produces better flow especially at higher rpm.We'd say standard engines don't need this custom manifold, and we don't really recommend it, but for modified engines running higher duration cams, it'll help at the higher rpm.</blockquote>

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