Billet 1L Liter Plenum Spacer Plate For Skunk2 Ultra Race Intake Manifolds 90mmBillet 1L Liter Plenum Spacer Plate For Skunk2 Ultra Race Intake Manifolds 90mm Key Featues: Made of billet aluminum Fits ONLY the Skunk2 Ultra Race Style Intake Manifolds, also fits our custom billet 8 injector intake runner kit Will NOT fit the Skunk2 Street Race Style Manifolds Increases the internal volume of the intake manifolds by 1 Liter resulting in increased airflow & hp Includes 2 x gaskets and extended intake bolts