Performance exhaust systems are a key component in maximizing your Duramax's fuel efficiency and horsepower. The L5P comes equipped with the a DPF (Diesel Particulate Filter) which is designed to reduce emissions. Unfortunately emission reduction has left many Duramax owners wondering where the once fabled fuel economy of the diesel engine has gone. Optimize your Duramax's efficiency and output with a performance exhaust system. Choose from the categories below or call us toll free at 1-800-823-4444 for professional advice and service.