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For just about every other stick on appearance mod I would say can just use 3m tape, with the amount of air coming over the hood in direct contact with a scoop I would say drill it to be safe.
Bolt on will insure that it will stay where you put it. Mine came with 2 plastic pins in the front that were suppose to hold with clips and tape on the side. I modifided it to use 4 stainless steel bolts and tape all the way around. Passed the 100 + mph tset with no problem.