The plumbing kit allows for easy integration with the the OEM fuel system. Unlike others on the market, the kit does not reuse the awkward 180 degree feed line with the fuel rails fed in series. Instead, this kit eliminates any unnecessary fuel hoses that route over the top of the engine preheating the fuel. The kit plumbs the fuel rails starting from the OEM hard pipe near the firewall and feeds the rails in parallel for even fuel distribution with the use of our high flowing Y-adapter fitting. All hoses are high quality PTFE and are compatible will all fuel types including E85. Billet aluminum O-ring plugs are included for all unused ports on teh fuel rail.