Ford Focus Forum, Ford Focus ST Forum - View Single Post - removing airbox top
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Old 05-22-2013, 12:31 PM   #12
The Professor
Join Date: Oct 2003
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Originally Posted by dyn085 View Post
The short answer is no. The only benefit you'll get by running with the lid off is a warmer intake charge. At the very least you'll need to replace your filter with an aftermarket drop-in.

Plus the noise it makes is horrible!
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