SKUNK2 K-SERIES FUEL RAIL FOR ULTRA STREET & ULTRA RACE MANIFOLDS PRIMARY SECONDARYWeve streamlined the process and revised the design of the K Series Ultra Fuel (350 05 7000) to replace the Ultra Fuel Rails listed below. The Skunk2 Racing K Fuel Rail is the perfect compliment to the Ultra Street Manifold and especially the Ultra Race Intake Manifold with its dual injector positions. This K Series Fuel Rail is used for both the primary injector position and the secondary injector position. One rail, two positions. 350 05 6050 DISC K