Talk:Variable Length Intake Manifold
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Variable Geometry Intake Manifold Design Project: http://umsis.miami.edu/~ainteria
The Ford 2.5L Duratec also has variable-length runners. They are selected by a butterfly system in the lower intake manifold (LIM).
It should be noted that Resonance Intake System and Variable Lenght Intakes are very different things
http://www.autozine.org/technical_school/engine/tech_engine_2.htm#Variable-Intake