Seller notes

The Aero Turbine 4040XL performance diesel muffler is the result of years of design and engineering. It has been proven to lower exhaust gas temperatures while increasing horsepower and torque. Many customers have told us that they have seen drastic increases in fuel mileage by installing the 4040XL on their diesel trucks. The 4040XL is built with a non restrictive internal resonator that reduces rasp and drone. This resonated model will give you a more moderate exhaust tone with the same increa...

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