Anyone else have this problem

[BMWFan]

My X5 4.4i has about 6000miles on it. Under moderate to hard accelleration, I hear a ticking sound. It is almost the same sound one would hear if there was an exhaust leak from the exhaust manifold or exhaust system. The dealer claims this is normal and they hear it on all the 4.4i X5's.

Has anyone else noticed this, or am I just getting a typical dealer answer when they don't want to address a problem?

Thanks for any help you guys can lend.