You know, I do not like to follow, therefore I tried new exhaust as my mod. It is a street version (TUV approved) whatever that means. It is not a racing exhaust systems. I still have OEM resonators, that I will replace with SuperSprint x-pipe shortly. I will give this cans about a 1000 miles of burn-in and see what sound I get from them. They do sound better than OEM, but maybe not as lound as I would like them to sound. I love the sound when I decelerate from about 3K downwards. The the tips look good, workmanship is very good, and they are lighter than OEM mufflers. The prive is much lower that any other option I have explored. It is my test, to see if lower cost exhaust can be used on M5. I have not been able to locate any sound files for Scorpion, therefore it is my contribution for any of you who want to hear comparison between OEM exhaust and Scorpion pipes. I have Scorpion pipes on my Honda VFR bike and love them. I have created movie to document change in sound from OEM, to Scorpion and Scorpion after 200 miles. I still have OEM resonators on. I will update this thread after change to x-pipe.