Increase your horsepower and torque with this hand welded muffler for 911 models. Available in three options: Glass Pack (street), 3M Street (models with mechanical fuel injection) and Steelpak for those who want a quieter muffler. It has the familiar low and throaty Bursch sound due to less back pressure. Each one is painted gloss black and has polished chrome exhaust tip(s). Only hand tools needed for installation. This muffler will be louder than a stock muffler.