Big Rig Power stocks manifolds that have been designed to improve your factory product. Our manifolds are cast from high quality blended steels for toughness and heat tolerance. Thicker exhaust flanges and center dividers provide greater strength and durability. The joints have tighter tolerances, 50% more surface contact and are press fit to eliminate leakage. The smoother design allows even airflow to the turbo. High-temperature resistant Ceramic Chrome coating adds an additional heat barrier to keep exhaust gas energy moving to your turbo to improve turbo response. All manifolds are flow tested to ensure that they flow at least 20 Cubic Feet of air per Minute (CFM) more per port.