Front ones can cause damage to the paint work on the wing and leading edge of the sill as the water drains down behind them. I fitted them to my previous car and found that all the dirt built up behind them. My current had them fitted in the past but the previous owner removed them for the same reason and there is slight damage to the paint.
I also found, with the ZT, that going over speed ramps that I was forever scuffing them so they quickly got damaged.
They did however prevent the spray from going all up the doors in wet weather.
I do think they finished off the bottom of the wing but just not the best of designs.
I didn't see much benefit to be gained from the rear mudflaps
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