I´ve first put the X pipe but the noise wasn´t exactly what I was looking for, but you could tell the difference. Than I put the Remus exhaust and the sound got much more powerful.

Here´s my post with a video sound of my car with X pipe, and x pipe + Remus.
http://www.xoutpost.com/x5-e53-forum/...nd-clip-s.html

NOTE: The video sound don´t do justice for the sound difference between the two.

J.Seven