With nearly 200,000 ft and growing of USA based design, manufacturing and distribution facilities, our engineering team is working around the clock to deliver the highest quality, best performing line of BBK performance products which includes a full line of performance fuel system components. From adjustable fuel regulators, high flow fuel rails and an assortment of replacement high volume in tank and in line performance fuel pumps. BBK GM Tuned Port 305 / 350 Adjustable Fuel Pressure Regulator Kit. Processing begins as soon as an order has been placed, therefore we cannot change, cancel or modify orders once they have been confirmed. Most e-mails are answered within 24 hours, including weekends and holidays.