Planning an LS engine swap or upgrading your fuel system? This Quantum fuel pressure regulator/filter combo is a must-have. It's specifically designed for LS1, LS2, LS3, LS7 swaps using returnless-style fuel rails – super popular for C5 Corvettes (1999-2004 5.7L) and TBSS/NNBS Gen IV intake manifold swaps. It delivers a fixed 58 PSI fuel pressure and includes inline filtration between your pump and injector rail. The kit comes with one 8AN outlet fitting and two 8AN inlet fittings, making plumbing your fuel lines way simpler. Replaces a bunch of part numbers like Wix 33737, AC Delco GF822, and others. Made in the USA by Quantum Fuel Systems, who offer a lifetime warranty and have a killer customer service team based in Ventura, CA (they even speak Spanish!). Whether you're building a track monster or a street cruiser, this regulator keeps your fuel flow steady and clean. Get it dialed in and hit the gas with confidence!