Skunk2's all-new B Series 90mm adapter now offers B-Series enthusiasts even more flexibility. Manufactured out of 6061-T6 billet aluminum, B-Series throttle bodys can be bolted on to the new Ultra Race Series intake manifold. Enthusiasts now have a few options for throttle bodies. Each unique, CNC-machined and hard-anodized throttle body adapter features a 74mm opening, recessed holes for easy adaptation, and all necessary mounting hardware is included with each adapter, making for an easy installation.