Originally Posted by X53Jay4.8is

Yes the X-pipe with the Eisenmann Race is much too much noise. You will have drone and few other nasty noise variables (pop crackling) in the vehicle. I have the Eisenmann Race on my 4.6is X5 and its awesome but I did leave the factory resonator in place. The resonator has a lot of sound absorption material in it. leave it on. I think you will pleased with unit.