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Hello Gothaur,
never heard such an intermittend sound from a Boxster.
Sounds like it's caused by pressure / under pressure.
Could you please open the filler flap and check if the noise comes from the filler cap. There is also a valve beside the filler pipe that can cause noises.
If the noise is coming from a different place, could you please check if there is a difference when the front wheels are straight or the front wheels turned in fully. So maybe it could be caused by the steering pump.
Maybe also open the front trunk and check if you can locate the noise better then.
Thanks and regards
Markus
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