B&M 46057 CommandFlo Adjustable Fuel Pressure Modifier with Silver Aluminum Case Bolt-on modifier for stock fuel regulators is adjustable from 25-60 PSI Expands your air/fuel ratio tuning options by giving you the ability to control the fuel pressure CNC machined 6061-T6 billet aluminum case with silver finish for durability and a custom look Useful for vehicles with free flow intakes and exhaust systems Not legal for sale or use on emission controlled vehicles.