The MagnaFlow Sys C/B 01-05 BMW 3-series 2.5/3.0L is a performance exhaust system designed specifically for the 01-05 BMW 3-series 2.5/3.0L. It is constructed from stainless steel for maximum durability and corrosion resistance. The system includes a muffler, a resonator, and all necessary hardware for installation. It is designed to increase power and torque while giving your car a deep, throaty exhaust note. It is also backed by a lifetime warranty for added peace of mind.