Single Plane EFI 4500 Split-Design Race Intake Manifold- GM LS1/LS2/LS6 Cast Finish with Fuel Rails HolleyThe manifold with An 8 fuel rails fits Gm Ls Gen Iii engines with cathedral port heads and has a 4500 Dominator style carb flange for carburetors, EFI throttle bodies, or EFI throttle body elbows, and is configured with a Ls Map sensor port along with other NPT plenum vacuum or air temp sensor ports. The new Holley Single Plane Race intake manifold is designed with maximum performance in mind. Featured is a two piece split design that provides access