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audi a4 b5 tdi turbo problem??? please read

Posted: Sun Jul 05, 2009 10:01 am
by audi_rs2
hi.
I have an audi a4 b5 TDI 110 bhp.when i start its noise {a hiss} when speed. I asked different people and said it is turbocharger.
I have changed the turbocharger but is the same whistling.
can u' help me?
can be intercooler ??
thanks