I think it's simply something aesthetic and improve the sound.
A symmetrical exhaust tip is prettier than only on one side. It's as if there were only headlights on one side of the front.... : D
BCforged HB29 - M4 trunk - H&R SuperSport - 435i type exhaust cf Cyba tips - M4 grills
Last edited by jazza; 11-20-2012 at 04:14 PM.