Pacbrake’s Direct Mount 4 inch PRXB High Performance Exhaust Brake Kit with Max Flow Design for Dodge 1994-1998 5.9L 6BT 12 Valve Engine with 3 inch Stock Exhaust with HX/HY35 Turbo with Standard Transmission. PRXB exhaust brake offers the highest braking power to lowest price ratio available. Pacbrake’s flagship product is the unquestioned leader in the supplemental brake industry. It has changed the way people think about exhaust brakes by providing performance, safety and durability that is unmatched by any other exhaust brake on the market.