Hi, I am still running my 1.8T Sport, now has 203426 miles, I should have another car by now, but cannot find the right one, missed 2 good ones, A4 2.0TFSI Speicial Edition prefer 2007 Model. Anyway, I am getting flutter from the Turbo, even reving the engine, and when driving the boost is not comimg in correctly, I used to be able to pull about 15PSI, now i strugge to get over 5 PSI ( I have a boost Gauge fitted) The car accelerates like the clutch is slipping, the the boost picks up. Tick over boost gauge reads good. I am thinking it might be the Diverter Valve sticking, I am running a Hyperboost and never touched it since I fitted it many years ago. I will check all pipes this weekend for leaks, and help from you guts would help.