Really, 5 minutes. Took longer to down/upload the photograph and write the post than it did to do it.
7/32 nutdriver, blade screwdriver, 2 3/4 inch holesaw.
Edit: there was supposed to be a photograph attached. I'll try again.
It is where you cut a hole in the grill support to allow air to flow through the grill and into your air intake more easily. I havent seen anyone get any actual performance gains from it yet though but it does work in theory. IMO.
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