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Brothers Performance offers a wide selection of high flow 1999-04 Mustang X pipes from BBK, Pypes and Magnaflow. X-pipes have been proven to help increase the efficiency of your Mustang exhaust system to improve performance. They are direct replacements for your factory Mustang mid pipe and will bolt up to stock and aftermarket shorty headers and cat back exhaust systems. These 1999-04 Mustang X pipes are offered in large diameter mandrel bent stainless steel and aluminized steel tubing. Choose an off road Mustang X pipe or one with high flow catalytic converters for street legal use. These 1999-04 Mustang X-pipes offer increased horsepower and torque over stock and add a better deep, slightly raspy tone to your exhaust system.