It would be a very minimal restriction. Especially since the car has a turbo pulling in air. This pre filter is a dry filter, so it's supposed to help against water, mud, and dirt. Keep in mind you cannot submerge the filter.
After my last filter change it was just a bit more dirty then I liked so this is my solution. Hopefully I can just reach in, pull this off and wash it rather then trying to remove the whole filter all the time.
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