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I have a 2018 ES and I recently installed a K&N CAI on it. I love the power and the added responsiveness. I wanted to see if anyone else has one of those intakes and experienced an air sucking sound from 2-4K RPM. I checked all of the fittings multiple times for a vacuum leak and I don't hear one. It doesn't happen when idling, just accelerating. The air sucking sound is pretty loud and stops as soon as I let off of the gas. Is this normal for one of these intakes?
 

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I have a 2018 ES and I recently installed a K&N CAI on it. I love the power and the added responsiveness. I wanted to see if anyone else has one of those intakes and experienced an air sucking sound from 2-4K RPM. I checked all of the fittings multiple times for a vacuum leak and I don't hear one. It doesn't happen when idling, just accelerating. The air sucking sound is pretty loud and stops as soon as I let off of the gas. Is this normal for one of these intakes?
Is this your first turbo vehicle? If so, welcome. Yes that is normal.
 
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