FUEL PRESSURE REGULATOR Adjustable, high-volume regulator ensures proper fuel pressure in your high-performance fuel-injected car Enhances the performance of other power-boosting components in your car Machined billet aluminum Bolts on in place of original-equipment regulator. No cutting and no metal shavings! And no fuel leakage and leakage past the factory seat as with other so-called upgrades. Accents the factory vacuum and return line. Included fitting lets you convert the return line in an AN-style steel braided line. Designed for use with an in-tank fuel pump upgrade. NOTE: SKU numbers ending in F are factory shipped and may take a little longer to reach you.