Billet Intake Manifold 3/8" Fuel Rail Kit Fits LS LS1 LS2 LS3 LS6 W/ Hardware. 【Application scope】Billet Fuel Rail Kit is only suitable for LS LS1 LS2 LS3 LS6 after-sales intake manifold, not suitable for inventory manifold/oem equivalent, not suitable for fast intake manifold.