I have the Challenge on order. It's different because the spoiler doesn't elevate but extends straight back. Some of the others just distort the flow lines and when I price compared, it was only a few hundred more for the challenge - plus the thing is LIGHT!! The last thing you want to do is get something you aren't happy with and later wish you had spent a few hundred more for something you'd rather have.
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e90M3, sold: Akrapovic // Brembo // VRS // Eisenmann // Advan RS // ESS // Challenge
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