Pro Two-Stage Injector Plate, 1 in. Thick, w/4 Spray Bars, Plate & Jets Only, Holley Square Bore, V8 - Assure a steady, precise metered flow of nitrous and fuel for reliability. Backed with years of laboratory research, as well as dyno and drag strip testing. NOS Injector Plates are available for those who want to build their own system or upgrade their current nitrous system without having to go through the expense of a new complete system. This NOS Injector plate incorporates a low profile (1 in. thick) design and is constructed of solid billet or die cast aluminum with a durable black finish. Included are all applicable gaskets, studs, jets and plumbing.