The ISR Performance MBSE Axle Back Exhausts IS-S2MBSER-E36 is a high-quality aftermarket exhaust system designed for use on BMW E36 models. This axle back exhaust is constructed from durable stainless steel and features a 2.5 piping diameter for improved exhaust flow and performance. The exhaust is designed to replace the stock axle back section and features a straight-through design for a deep, aggressive exhaust note. It also includes a resonator to help reduce drone and improve overall sound quality. This exhaust is a direct bolt-on installation and does not require any modifications to the vehicle. It is a great choice for those looking to improve the sound and performance of their BMW E36.