Designed for Gen IV engineswith 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. Theunique dual-plenum design features 13" long runnerswith flanges that will accept two, 90mm GM LS3 throttle bodies. The unique cross-ram dual-plenum design is ideal for twin turbo applications. When matched with high flowingair filters and inlet tubes, the dual-plenum system gives neck-snapping performance withplenty of options for engine builders and tuners. Dyno testing resulted with gains of27 horsepower and 28 ft-lbs. of torque over a popular aftermarket manifold.