The installation of the 034Motorsport C4 S4 and S6 Exhaust System is very straight forward, however we wanted to highlight 2 areas of modification that are required to make the system fit correctly The first involves relocating the center exhaust hanger pictured below. All that is required is the relocation of the hanger bolt from the stock location to the hole adjacent to it. We also recommend using our chain exhaust hanger to increase ground clearance as the factory rubber hanger is usually stretched and causes sagging. Second, due to the size of the muffler we use, the rear drivers side exhaust hanger bracket must be replaced with the one we supply. That's all, enjoy your new exhaust system!