Recently I had the pleasure of meeting up with a guy at my local gym that just so happens to have a silver e39 m5 like mine. We talked for awhile and we were both in awe from each other's exhaust system. I had a complete custom exhaust muffler delete with resonators and he happened to own a complete Britalman exhaust with a Britalman xpipe. He explained to me that he felt the car was too quite at speed and he wanted more sound. I actually wanted less sound. Could of days later we swapped. I cannot be HAPPIER!