got a 1.8t engine and i went out in it tonight , was running fine and floored it and went fine , slowiing down it started making a crazy knocking noise and then carried on from there , pulled up checled timing and it appeared to be fine , took spark plugs out and it isnt as loud but then put them back in and its really loud, still same amount of power and no miss firing , sounds like its coming from the bottom of the engine near the bell housing ,