Aeromotive Billet LT1 Adjustable Regulator - 94-97 F-Body GM/94-96 Impala SSOriginally developed with the GM LT 1 engine specs in mind, these regulators were designed to keep these cars performing at their peak potential. These rail mount EFI regulators fit a variety of factory GM vehicles. Adjustable from 30 70 PSI. Fuel pressure rises on a 1: 1 ratio when referencing boost. Stainless steel spring, custom designed for precise fuel control. A true billet regulator, CAD designed and CNC machined. Return adapter may be replaced