Hallman Boost Controllers has been in business since 1995. Hallman offered the first closed loop manual boost controller at an affordable price. Hallman's boost controller's offer the fastest spoolup of your turbo, steady boost and easy adjustability. Hallman Boost Controllers are machined and constructed of high quality materials. Hallman uses 316 stainless steel and brass materials for their valves and internals. This insures a long life of the product and repeatable performance. All of Hallman Boost Controller valves have been redesigned for 2002. Also in the redesign Hallman has incorporated a slightly lighter spring to help make the adjustment less sensitive. Also, they now have all of their valve bodies hard chrome plated for a nice appearance and durable finish.