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I tried turbosmart kompact, its way smaller inside than stock bov and gave me turbo flutter. Thought it was shite, snd ditched it, put stock back on. Small hole is 'slight leak' making the on/off of bov smoother but less responsive. Plug it up as scotty says, better from a performance point of view.

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Smaller inside? Mine doesn't flutter, even on 40 psi.

The springs are replaceable, and they come slightly on the tight side from the factory. If your setup flutters slightly you could just ask them for a softer spring.

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not stock about 400hp @wls , I was getting a whistle noise on full boost.like a leak. I since have blocked the mentioned whole , and now whistle is gone, but bov now sounds different.

I'm actually getting the same thing, any chance of getting a photo of the aforementioned hole?
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I'm actually getting the same thing, any chance of getting a photo of the aforementioned hole?

Take off your bov. Look at it.

If you can't see the hole give up on everything.

You can't block.the hole with the bov on the car.

As the hole is a little larger than m5 tapping size you can simply cut slots in a bolt to make a tap if you don't have a tap handy.

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