BMW E87 120i Custom Exhaust Sound Cold Start

Finally got my back box deleted. I did not rev the engine too much because it was still cold. I wanted a very specific sound. I did not want the raspy ricey sound with a straight pipe. I wanted a deep low frequency sound when stepped on the gas. This was achieved by adding a silencer before the tip. It was a 20% sound reduction in comparison with a straight pipe. Inside you can drive without headaches from the sound, and you can hear the engine if you step on it. Love it!