Edelbrock Manifold Chevy Ls LS3 Cross Ram w/ Red PlenumsEdelbrock part #71413 LS3 Cross Ram intake manifold is designed for Gen IV engines with LS3, L92 and L76 rectangular port cylinder heads. The Cross Ram LS3 is ideal for anybody looking to combine great looks and outstanding performance between 1,500 7,000 rpm. The unique dual plenum design features 13" long runners with flanges that will accept two, 90mm GM LS3 throttle bodies. The cross ram dual plenum design is ideal for twin turbo applications.