Modifying intake for more air
#11
Actaully as restrictive as you think your intake (plenums) may be they really are not........they do exactly what they were designed to do.......deliver torque to these heavy trucks. Drop in K&N filter is about all you can do......however, for that extra peace of mind.....find the tube that goes from the airbox to the core support from either a 300-6 or a 460.......the airflow is more direct than what these 302's and 351w's come with.