The headlight bulbs are 9004. I run 85/100W bulbs in both of my cars, which greatly improve the sub-par headlights to at least acceptable levels (sorry, guys, but my Honda lights were a lot brighter at 55 watts). However, you'll likely need to upgrade the headlight sockets, as the OE ones tend to melt with the higher wattage bulbs.

Good luck!

__________________
"If God had meant for us to walk, why did he give us feet that fit car pedals?" Sir Sterling Moss

Michael
2014 E63S Estate
2006 SLK55
1995 E500
1986 Porsche 944 turbo