K-Tuned Center Feed Fuel System. This complete kit is designed to work with an Inline fuel filter and our K-Tuned center feed fuel rail. This is a complete K-swap fuel system, which includes pre-assembled fuel lines, Inline fuel filter, K-Tuned fuel rail, K-Tuned FPR with gauge, K-Tuned 6AN wrench and clamps. 100% Authentic K-Tuned Products. Complete K-Swap Fuel System. Included Fuel Lines, Inline Fuel Filter, Fuel Rail, Fuel Pressure Regulator with Gauge and 6AN wrench and clamps. Fuel Pressure Regulator must be mounted on the driver side shock tower in front of the brake master cylinder.