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Old 01-10-2013, 04:03 PM   #85
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What I Drive: 2011 Black Ford Focus SE 2.0

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Hey Crice, do you any experience with the prefilter? I was listening as close as possible with my sis tapping the gas and I'm pretty sure I isolated that hissing sound coming from down where the filter is. It could be the silicone coupling, clamps or filter but its definitely down in that area. The reason I ask is that the prefilter feels and sounds like that cheap-swooshie pants, wind breaker material. The type of material that would make that sound. I have a hunch it could just be the air getting sucked through that. It's definitely down in the filter area, an area I can't see directly into, all the hoses and seals up at the top of the intake/throttle body are tight and sealed.

Jus figured I'd suggest that in case you did have the prefilter and yours doesn't make that sound. I could rule that out. If not then I'm gonna have to remove splash guard and take a good look at that end.
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