The answer to that question is pretty easy, wait until you install yours and accidentally let it rest on part of the trunk before you actually have it 100% lined up and try to pull it up to re align it. That will quickly convince you that the tape is fairly permanent and never a worry about it coming lose.
Since we arent doing any racing in these, technically the rear spoiler for downforce on the rear and front splitter for downforce on the front, arent necessary, just for looks. So if you like the look of the splitter, knock yourself out but certainly isnt necessary just because you have the rear spoiler.
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Originally Posted by AweSam8
So this spoiler is just held by double sided tape? How effective will this be in the long run? I thought BMW noted on their website that you should pair this with the front splitter, so is this splitter not necessary?
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