Our oem fog lights use 9006 halogen bulbs, capped at the end, 55 Watts, 1000 lumens. Using a modified 9005 halogen bulbs, no capped at the end, 65 Watts, 1700 lumens and you should see a difference. I don't have an oem fog lights but I have a catz fog lights at the oem fog lights locations. I did this 9005 modified bulb on my other vehicle and saw a big difference. Check the link below how to modify the 9005 bulb. BMW E34 Website
