Grand Rock has Quiet Performance mufflers available for dual-exhaust trucks. These patented, new-technology mufflers provide an average fuel mileage increase Grand Rock has Quiet Performance mufflers ...
The Walker Mega-Flow NoiseBraker muffler, manufactured and marketed by Tenneco, is designed to provide a direct retrofit for Class 7 and 8 vehicles, capable of reducing backpressure and quieting the ...
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