System The MagnaFlow 12 BMW 328i 2.0L N20b20 Dual Straight D/S Rear Exit Stainless Cat Back Performance Exhaust System is a complete exhaust system designed to enhance your BMW's performance. It features dual straight-through stainless steel mufflers and a rear exit design for a deep, aggressive sound. The system has mandrel-bent tubing for maximum flow and performance, and is constructed from high-quality stainless steel for durability and corrosion resistance. The system also includes all necessary hardware and clamps for easy installation. This cat-back exhaust system is an ideal upgrade for those looking to boost their BMW's performance and achieve a great sound.