mud flaps will keep your x3 cleaner especially in rainy/snowy seasons. I was looking at a set on Amazon but some ppl complain about how those although labeled as OEM start to wear out and get beat up. Not sure how or where those drivers drive but I've never heard of mud flaps wearing out and losing shape. They should be rigid plastic deals. If the price is comparable we'll pick up a pair from an actual bmw dealer and post pix. They actually make the x3 look just a little sportier too.