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cheeseman are you sure you didn't over boost for whatever reason and the car go into limphome mode.

when the esp is active or operating it will flash as far as the boost check all hoses through the whole induction system also the reserculation valve could be stuck open and may just keep reseculating the air im not sure if your problem is a symptom of that. check the waste gate as well the oly...

ok i am running the best fuel available at US pumps i dont think that is the problem the noise however is very odd i have only had it for a week and i just have come to the conclusion that i need to get some K04's does any on know a good sorce

93 octane what is your boost and how long have you had this your noise

yeah O2 sensors seem to be ok boost is 18 lbs and steddy no EML other than the noise seems to be fine

my 02 s4 made realy great power more than normal and now my left turbo sounds oddly like a super charger, has anyone had this problem.