I did the switch with my 540. I have a 2001. I purchased the bumper, new foglight assembly, the undershields, brackets. You are looking at the cost of parts, labor and paint. Ironically, I bought the ACS splitters another time, had to pay for parts, labor, and paint. Then, at a different time, I did the HID fog light conversion, parts, labor and paint. Rooz, if you do this, seriously talk, to your mom about the fog light conversion initially. If I had to do it again, to save money, do it all at the same time.