Just read through this, including page 4. I noticed the buzz/rattle under acceleration since day one. Now have 3000km on my car and it is still making the noise, just as everyone says - under moderate acceleration from 2400rpm up to about 2800rpm. I was sure it was a heat shield or a baffle in the rear muffler...
Guess that means I've got a "normal" GTI?
Cam.