Speedworks Custom Alloy offers top-of-the-line billet aluminum intake manifolds for LS1, and LS3 applications. All of their intake manifolds are available with single or dual fuel injectors per cylinder for no additional charge. All intake manifolds are CNC machined from billet aluminum, and they will come standard with the fuel rails installed. The standard finish will be natural aluminum, but black is available for an additional cost. Speedworks Custom Alloy billet aluminum intake manifolds are an excellent choice for a boosted application, as well as to add a great show piece under the hood.