I'm wanting to add mudflats for my M3 but want to make sure I do it right to begin with. Not looking for the cheapest or the biggest but something that works very well and won't lead to any problems down the line. I'm willing to pay a little extra to just do it right to begin with. I like the idea of using the existing routing points instead of drilling but am not sure if that is the best way to actually go about it. I have seen some people talk about getting some PPF done under where you attach the flaps to protect the paint under them and some even mention adding little foam or double sided tape. Seems like PPF would be cheap for small sections, but I'm not sure where to get it. Any recommendations? Thanks.