I just purchased soem mustang inserts form mustangtuning. I live in RI and was wondering how the insert hold up to the cold weather in the NE. I know they are stainless steel but I have a license frame that was ss and it look like crap after the winter. I know this is not a tech questions. I do not plan to drive in snow but I will drive some days after when the roads are better, but there still may be soe sand or salt on the road.