The FAST LSX intake manifold has revolutionized the performance of the GM LS-engine world by delivering increased power, versatility and light weight. The release of these FAST LSX LS1 EFI fuel line conversion kits make it easy to take advantage of the power benefits of the LSX manifolds while using the FAST fuel rails to further enhance fuel delivery. Two kits are available, with or without the in-line fuel pressure gauge, along with complete instructions to make installation a snap. These FAST LSX LS1 EFI fuel line conversion kits include all of the fuel line parts, consisting of the rear crossover line, the main fuel supply line and the push connect fitting and plug to convert the factory 3/8-inch fuel line to -6AN lines. The FAST LSX LS1 EFI fuel line conversion Kits with the in-line fuel pressure gauge features a 1 ½-inch diameter midnight silver encased, 0-100 psi liquid-filled gauge with a black face and easy-to-read white indicator needle. The FAST fuel rails must be purchased separately.