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Wrx Pro-R panel filter noise


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Hi, looking for some opinions/advice if possible.

I have just fitted a Pro-R panel filter to my 59 plate WRX. The car is standard in all other ways. I fitted it myself which was a simple I thought, everything went in and out as it should.

When I took it out afterwards, I noticed a noise, which I can only describe as similar to a very quite dump valve type of sound, with a bit of a hiss/whoosh sound when changing gear.

I've checked under the bonnet with it running and there doesn't seem to be any air leaks, and it doesn't make the noise if I blip the throttle when stationary.

So.... Is this just an induction noise due the the less restricted filter ? Has anyone else experienced it ?

I do like the sound, but just not sure if it should do it !!!

Thanks in advance for your help.

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Thanks for your thoughts, that's what I'm hoping.

I just wasnt sure why it is so noticeable when I change gear. I'm no mechanic, so I couldn't figure in my head what the air would do when you let off the accelerator/ dip the clutch, if you see what I mean.

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