Wow, I would say this is pretty good for a 12v..
but hats off to you!!
my 24v has 200k on it and strong as hell!! Driven hard and well taking care of!
but I am thinking I am having some issues w possibly the dual mass!!! cant pin point this sound that comes and goes after a long ride or driven spiritedly..
My friend who works @ VW has ruled out Chains, although I am not able to get the car to duplicate this sound when he is around!!