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GTI MK5 K04 Conversion Woosh

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K03MK5:
Hi all have a Golf GTI MK5 Full K04 conversion stage 2+ and everytime under accelleration I can hear a woosh sound if that makes any sense just before the gfb dv+ kicks in. I have the latest pcv revision r and revision g dv. It seemed to of started when the toyosports fmic was fitted.

pudding:
All that boost has to go somewhere when you back off the gas. Assume you have a sponge on a pipe type intake kit?

K03MK5:
Hi yes of course.  Come to think of it the turbo that came with the kit has an anti surge core upgrade.  So I presume its that.

pudding:
Yeah anti surge housings are noisier than plain ones.  That's why VW fitted a noise reducing muffler to the turbos  :smiley:

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