I used betalink for my splitters and spoiler on my last M3. That's the way to go if you don't plan on removing. The bad: Beta link can be a pain to work with, the stuff just ends up on everything. You've gotta be johnny on the spot with the remover to clean up. The good: You're spoiler won't come off if you use betalink. I personally wouldn't trust tape with this spoiler, it's got a decent size bill that has quite a bit of down force on it at speed.
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