Thanks to this forum I now know to tighten my sway bar when I hear the knocking noise up front.

Now for another noise.....after the car has been driven for a bit, when I take off I get this "houling" noise from the rear, It sounds like the brakes..almost like the e-brake is stuck (I already checked this). It only lasts a few seconds and can sometimes be replicated when I am in neutral and coasting slowly to a stop when I apply the brakes. It is very loud and annoying.

I am going to the dealer...hopefully someone out there can "load my lips."

 

I think what you are hearing is your Hydraulic pump making that sound. Alot of other people including me are hearing the same noise at low speed, low RPMs. It's a design flaw in the pump itself from what I've read. Check out the TT and 996 forums.