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Bonneville GXP/ Northstar Powered Cars Discuss your Bonneville GXP and/or any other Northstar powered Olds or Cadillac... Including the 3.5L Twin Cam V6 (Short Star ) 4.0L and 4.6L Northstar V8's. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 09-21-2005, 08:37 PM   #1
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When talking about intakes, what exactly will make an intake hiss? On my 3.5 between 3,000 and 5,000 RPM I get a very loud, distinct hissing sound. It sounds similar to a turbo spooling up. Now, does this typically mean that the intake is restrictive, or is it something else? It made this sound with everything stock, and it'* louder even with my gutted airbox setup. It'* not a bad sound, I'm just looking for the cause of it. I'm not going to drive around without the air intake on either to test it.

Hoov, your 3.5 make a hissing sound under heavier (not WOT) between 3-5K rpm?
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