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Boostin' to the limit!
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Hey man, you should come up here to Honolulu, we're starting are own MKIII owners club, good stuff man....:)

Anyway, that "chu chu chu" sound you get is compressor surge. The stock bypass valve isn't opening properly, which means air is coming back into the turbo, bad bad bad.....:mad: You should invest in some aftermarket BOV, nothing too expensive will do since you're running the stock turbo....
 
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