Aeromotive Extreme Flow EFI Regulator 13133 - Extreme Flow EFI Regulator. Designed for use with Belt or Hex Drive Fuel Pumps . Expanded, 5-Port Body with 1 - AN-10 plus 4 – AN-08 inlet/outlet ports, and one AN-10 return port. 0.500” High Flow Valve/Seat, able to handle 7-26 GPM Fuel Pumps. Dual Springs expand operating pressure range while maintaining a low profile and reduced weight. Standard spring (installed) supports 30-75 PSI base fuel pressure. High Pressure spring (included) supports 75-120 PSI base fuel pressure. Supports vacuum and boost reference on a 1:1 ratio with PSI.