The basic kit is the pedestal, collector w/bellowed up-pipes, valley return fitting and new hardware for installation. On the 94-E99 7.3L the 3in plenums are required when buying these kits. On these mounts the 3in Irate Diesel plenums are recommended as well with any turbo larger than a S366SX3 on the late 99-03 Superduty pickups.These 321SS Kits are better suited for people who are going to be drag racing and or sled pulling since the 321SS withstands higher egts withput distortion.
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