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0605st Banks Diesel Tuner 04 Z

The 4-inch-diameter Monster exhaust reduces backpressure by 98 percent, and unlike a gasoline engine, diesels actually thrive with less pressure in the tailpipe.
Banks Power PDA - Personal Diesel Assistant

The 4-inch-diameter Monster exhaust reduces backpressure by 98 percent, and unlike a gasoline engine, diesels actually thrive with less pressure in the tailpipe.  View Related Article