In the confines of a stock Duramax pickup, your engine's inherent power is limited by factory restrictions in the intake and exhaust Engine power is wasted by drawing air into a barely breathing intake and expelling gases through a backed-up exhaust. These airflow restrictions are responsible for the poor engine efficiency that soaks up fuel, runs a hot exhaust, compromises performance and shortens engine life.
Banks has spent decades honing the science of engine-airflow improvement. By replacing restrictive factory parts with streamlined, free- breathing components, Banks maximizes engine efficiency, mileage and durability-liberating healthy stores of horsepower and torque.
It's rare lo find a collection of bolt-on parts that actually work in harmony and build additional horsepower and torque from an engine, let alone find them all under one manufacturer's banner. Over the years. OFF-ROAD magazine has tested all manner of parts combinations, each one taking a different approach to enhancing a stock engine; some worked and some didn't. This time, we went to the source of diesel-engine performance, Gale Banks Engineering, and struck gold. Not only did it take one stop to buy and have our parts installed, but the parts worked as advertised and the results were awesome.