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Wondering if anyone has ever come across this problem before. My car is throwing no codes, I've replaced the PCV and when my car was in the shop for a clutch I asked them to take a look at it and they performed an "induction service" which I'm pretty sure is a load of crap, but tried it anyway...

Since I had my K03 swapped for a K04, I've been having fluttering noises like pigeons at low boost and the full-on 'stututu' noise at full throttle. There is also a point on about half throttle where it flutters around 2500-3000rpm, which is about the same point where on the K03 at APR Stage...