I bought a pair of Sylvania "VisionPlus" bulbs for my girlfriends 400E - They are highly rated "premium" bulbs. I can't really tell much of a difference over standard H4 or 9004 bulbs.

They are certainly NOTHING like my 300D 2.5 turbo with 100/90W rallye bulbs - with relays and upgraded wiring.

There is no substitute for cubic inches....

Tim