These elbows are designed for use in high hp race applications. An internal divider optimizes flow distribution to all ports of the manifold by reducing turbulence. High Flow Elbow #3849 is an ultra high flow version which measures 4.50" from flange to throttle body centerline (7.75" overall height). During flow testing this elbow provided up to 1,050 cfm with a 90mm throttle body and 1,150 cfm with a 95mm throttle body. Does not accept LS1 throttle bodies. Intake Elbow #3814 has a universal bolt pattern and is the best way to adapt a single throttle body to a Dominator® 4500 style flange EFI manifold without sacrificing air flow. The throttle body flange accepts 90-95mm LS1, LS2 and Ford 5.0L based throttle bodies. Intake Elbow #3815 is also engineered for use on a Dominator 4500 style flange manifold. It has a 120mm opening for maximum flow and is capable of over 1,400 naturally aspirated hp. The throttle body flange uses a 4.250" square bolt pattern. This elbow flows 1,800 cfm @ 20.5 in H2O. Includes a universal throttle bracket.