From carbureted to EFI pressures, naturally aspirated or forced induction, the X1 is designed to span the entire range of applications providing dependable fuel pressure regulation. Making the change from a carburetor to EFI or EFI to carburetor? There is no longer a need to purchase a new regulator. Simply utilize one of three conversion kits (sold separately) to match the operating range required of your engine. Replace original X1 Series regulator internals with the conversion kit of your choice (Part #?s 13013, 13014, and 13015) and you have a regulator with vastly different characteristics.