It is a silencer that reduces acceleration noise and eliminates the sharp, harsh sound of engine brakes. It can be added on to existing mufflers. It does not increase exhaust back pressure or reduce a truck's fuel economy. The article reports that a truck with a Silent Partner produces half as much engine exhaust noise as a truck equipped with a conventional muffler. Acceleration noise has been dropped by twenty-five percent.
Fuel economy remains good.
The Silent Partner has a warranted life of eight years or 1,000,000 miles. Brake, tire and exhaust life is extended, reducing maintenance and downtime. A better in-cab environment improves driver productivity and satisfaction, which leads to less driver turnover and lower labor costs. A quieter truck is seen as a higher quality truck, which can translate into higher trade-in or selling prices. The article explains that commonly-used ear plugs and ear muffs are passive noise reduction devices.