BBK Adjustable Billet Fuel Pressure Regulator for 86-93 Ford Mustang 5.0L. Fully Adjustable Fuel Pressure Regulator. Adjustable Pressure 25-65 PSI. CNC Machined Billet Aluminum – Blue Anodized Finish. Made In The USA. Allows Fuel Pressure Adjustment up to Approximately 65psi. Sturdy Billet Aluminum Construction. Direct Replacement for Stock Regulator. Easy Adjustment by the Simple Twist of a Screw. 1/8 NPT Fuel Pressure Gauge Port. BBK billet fuel pressure regulators are a great way to tune your vehicle to obtain optimum air/fuel ratios and achieve maximum horsepower with the simple adjustment screw located on top. Each BBK Performance fuel pressure regulator is made from high quality CNC Machined billet aluminum and is hand assembled and pressure tested with a precision leak free diaphragm that will allow fuel pressure adjustment to approximately 65psi. Every BBK Performance fuel pressure regulator is a direct replacements for your stock factory OEM pre set regulator and offer the best performance and value. All units have an anodized finish for great looks and long lasting finish.