AWE Non-Resonated Performance Mid Pipe for BMW G8X M3/M4AWE Non Resonated Performance Mid Pipe for BMW G8X M3 M4 AWE Non Resonated Performance Mid Pipe for BMW G8X M3 M4 Ditch the factory mid section and replace it with two 3" , non resonated mid pipes designed to up the ante in the aggression department. Mate the mid pipes to the SwitchPath" or Track Edition Exhausts if you prefer the party to start right behind the factory secondary catalysts. Note: AWE Non Resonated Performance Mid Pipes are designed to