The INTAKE spacer works, more plenum volume results in more air available for a given intake stroke. Throttle body spacers, especially the "swirl" type are really a waste of money on a EFI Ford. The air has to make to many directional changes for the "swirl" to survive and be of any use.
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No matter how much you spend, or how much you prepare, there is ALWAYS someone else faster or quicker than YOU!!!!!!!!!!
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