Trick Flow® replacement EFI upper intake plenums are computer-modeled to produce maximum torque and horsepower. The runner length and cross-sectional taper have been optimized to improve airflow throughout the rpm range and the symmetrical, high-velocity ports distribute the air/fuel charge evenly to every cylinder. These A319 aluminum castings work well with nitrous and fit under most stock-height hoods for an easy bolt-on installation. Available in several styles and finishes for Ford 5.0L, 351 Windsor, 4.6L 2V, 351C, and Clevor engines. Must be used with corresponding Trick Flow lower intake manifold base.