Megan Racing's Supremo Exhaust System is a good and easy way to add performance and looks to your BMW E90 M3 4 Door. Designed as a direct bolt-on to replace the stock unit, this axle-back system works in conjunction with the OEM Mid-Pipe and is easy to install using clamps instead of heavy flanges to reduce weight in the exhaust system and ensure proper alignment and positioning of the exhaust. Constructed of T-304 Stainless Steel and polished to a mirror finish, this Axle-Back system offers free-flowing performance over your OEM restrictive exhaust system and offering a sportier exhaust note. Being constructed of Stainless-Steel, this exhaust piece is much more lighter than your OEM system and offers increased Power:Weight ratio that plays an important role in the handling and performance of your vehicle. Specifications & Features: - 2.5" pipping -Quad 3" Stainless Black Chrome Tips design -Easy installation