Originally Posted by jqsmooth
It's a very useful mod. I'm glad I did it. And I used this feature during some heavy rain driving through Ohio on the interstate. I think it helps in heavy downfall as well as fog.
Totally agree that the rear fogs are useful in heavy rain and dark highways where it is tough to see the cars ahead of you.
I don't drive my M3 much in really bad weather (I'd rather drive my fwd Civic), but it's a good safety feature to have available as anything you can do to improve you being seen in really bad weather is a good thing.