Exhaust System The MagnaFlow SS C/B 87-91 BMW 352i/87-90 325IS/88-91 325IX/87-93 325 Single Rear Exit Exhaust System is a performance exhaust system designed to increase horsepower and torque while reducing backpressure and improving sound. It is constructed from stainless steel and features a single rear exit design for a clean look. This system also features a high-flow catalytic converter to reduce emissions and improve fuel economy. It is designed to fit 87-91 BMW 352i/87-90 325IS/88-91 325IX/87-93 325 vehicles and is backed by a lifetime warranty.