UNDER CONSTRUCTION Here's what PacBrake has to say about their Duramax exhaust brakes: Industry leading quality and performance make this new brake a natural choice on the 2001-2003 GM Duramax diesel. The PRXB exhaust brake's unique NEW design makes it ideal for in-city driving or for steep, long downhills. Optimum retarding performance is maintained by maximizing the exhaust backpressure throughout the entire RPM range. Designed with safety in mind and built on quality, the Pacbrake exhaust brake is a bolt on 'pays-for-itself' product that saves wear and tear on your brakes. When used all the time, this exhaust brake can extend the life of your service brakes by as much as 5 times. Designed and tested to bring the most retarding power while offering durability backed by the best Limited Warranty in the industry. Industry exclusive Arcor® nitriding, tuned orifice butterfly, heavy duty cylinder and many more features make this brake the best money can buy. Pacbrake exhaust brakes will save you money in the long haul. By using the brake all the time you are saving wear and tear on your service brakes which means reduced maintenance and money savings. Don't let your diesel and your wallet run away on you. Pacbrake exhaust brakes will keep both under control for years of peace of mind driving and safety. Before you make your decision.... Pacbrake's New PRXB™ Premium Exhaust Brake may be the brake for you! PRXB™ provides constant backpressure as engine speed changes to maintain optimum retarding performance throughout the entire RPM range. Click here to enter Pacbrake's PRXB™ site and learn more about this revolutionary advancement in exhaust brake technology.