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Message: <blockquote data-quote="MustangChris" data-source="post: 1243334" data-attributes="member: 10830">Under-drive, or over drive?OEM M112 pulley size for 03/04 cobra is 3.65" -- a 25% over drive would put you at a 4.57" top pulley (or you would have to change the lower pulley.)  This would lower boost, lower heat, lower RPM, etc.An under drive on the blower would put you at a 2.74" upper pulley (or you would have to change the lower pulley.)  This would increase boost, raise heat, raise RMPs, etc.to lower the heat of the mighty eaton you need to ensure the lobes are heat-coated (black coating), the *blower* is equipped with over-drive pulley (or crank is equipped with an under drive pulley), or use artificial cooling methods (Meth.)</blockquote>