The rear tires in particular will stick out. Some like it but it will lead to more stuff being thrown up on the plastic and paint behind your wheels.

The flares are easy to install and make the overall vehicle look more aggressive but not obviously aftermarket.

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2012 F10 550xi Carbon black/oyster
2011 E92 M3 SSII/black
2012 W166 ML63 Steel grey/porcelain
2007 E93 monaco blue/beige (retired)
2010 E70 35d Space grey/saddle brown (retired)