In my experience I found that adhesive type (even the best 3M ) wont help much.
The only solution to have a permanent fixing is via screws which will prevent the flexing, twisting and falling of the splitter.
The OE splitter comes with additional holes and in my opinion they should all be used should you want a quality and sturdy fitting that doesn't flex nor comes off.
My splitter has been on for a good few miles, I had it up at speeds of 140mph and the thing is dead solid.
Its all in the installation.
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