Ford Focus Forum, Ford Focus ST Forum - View Single Post - K&N Drop-In/Stock Housing Lid
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Old 09-10-2012, 12:13 PM   #2
TboneZX3
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What I Drive: '12 SE Sport, '01 ZX3, '67 Bronco

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The only potential benefit you will gain from leaving the lid off is noise. If you leave the lid off, the intake will be pulling hot engine bay air in, which you do not want. Leaving the lid on will be best for performance and will be much quieter.
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Last edited by TboneZX3; 09-11-2012 at 03:27 PM.
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