I have new 2012 X5 3.5i which had some engine issue that dealer needed to fix prior to delivering the car to me. Hence, my confidence level is low and I am "looking" for new engine problems to pop up. Recently I noticed one unusual thing which I hope someone will help shed some lights on. I have noticed that most of exhaust volume ( I would say 90%) comes out only out of left (driver side) tailpipe and barely anything comes out of right tailpipe. Is this by design for V6 or a sign of someting not right with the engine/exhaust system? I owned 2004 4.4i before and as far as I can remember equal fume volume was coming out of V8 engine.