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ive had my s3 for the last 18 month, it had revo tech already fitted on the car, and recentley, after about drivin for about 10 mins it starts to judder like theres a boost leak, but ive had all the engine stripped and nothin found, ive had it on a diagnostics and they said it were my mass airflow censor, so i got a new 1 from audi and still no difference but it cleared the fault on the diagnostics, but still up on the diagnostics was an eu problem but the garrage has told me that wot the car is doin the ecu wouldnt cause the problem, and some days its different than the others, and now its not bi as bad for the last few weeks unless u turned left round a corner n then it judders goin round, and today it started doin it again in a straight line, but after about half an hor ov drivin the car it disappears like it never happend, it really is a strange thing and if anybody can tell me wot it is or if anybodys had the same experiance please will u leave a post, cheers HOLLAND

I used to have a car that juddered when going round corners with my foot down when low on fuel. That was cos the baffles in the fuel tank had come loose so fuel ran up side wall of tank. Best I can do on that one....

Have you had a diagnostic run on the Haldex unit?

my diff went on my car last year and when i got it repaired i had an uprated haldex control unit on, so its 50/50 split, so i wud be surprised if theres something wrong with that after 12months, but u never know.
It doesnt matter how much petrol is in it when it happens, it seems to be getin better in time, because about 2 month ago when it started it wouldnt move after 5 mins, and bein stuck in a junction u feel like a right prick, so u put the revs high to try to get it to move and in doin that ive buggerd my clutch up now, its on its way out