Secondary muffler bypass pipe, Porsche 911 C2/4 1989-94 (964); Carrera Cup-style "U" shape tube. Also referred to as the "U pipe" due to its shape. Top quality mandrel bent polished stainless steel pipe that replaces the secondary muffler that is located behind the passenger side rear tire. Can be used alone or combine with primary muffler bypass pipe, part number 964.13.36.001, for the best bang-for-the-buck upgrade and aggressive Carrera Cup car sound! Also fits 964 RS America model.