Focus Fanatics - View Single Post - whistle sound during acceleration
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Old 04-23-2012, 09:24 PM   #14
tukaniSVT
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Join Date: Mar 2004
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Location: SW Houston, TX
What I Drive: 2003 SVT Focus 2009 BMW 335i

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Depending on where in the engine, the Dual-Stage Intake Manifold sometimes whistles when you get up there.

My SVT Focus did that brand new back in 03 and then when I modified the intake and throttle body, the whistle happened at a different RPM and speed. Nothing to be worried about, just how the system works from the air.

-Ray-
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