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Message: <blockquote data-quote="uncltrvlnmatt" data-source="post: 508086" data-attributes="member: 8290">The IRMC were used in the 96-98 Cobra's and the Lincolns. Basically it is a valve that opens the secondary intake port at 3250RPM's.The way I understand it is that the heads flow to good at low RPM's and kill your low end torque. So Ford installed these flappers to shut the air flow at lower RPM's.Here is a quick write up on replacing the IMRC actuator and cleaning the secondary ports.<a href="http://home.flash.net/~ivc1/cobra/imrc.html" target="_blank">http://home.flash.net/~ivc1/cobra/imrc.html</a></blockquote>