If you wanted LED fog lights, I'd suggest driving three CREE LEDs in series at 3W each, for each headlight. That would produce probably 20 times the light output of a lone 1W and would probably be only slightly dimmer than a Halogen Fog Light for brightness -- if you engineered the reflectors/optics well though you could distribute the light much more effectively.
No i dont think they will performm well. nor did i buy them. The bulbs are for 9006 application for which mine is my 2005 dodge ram "foglight bulbs" even if i was going to build something with the crees i would have to open up the housing since i dont think i could get someting like that through the hole. I think i might go with the HOr bulbs though. Also on a side note,, i am waiting to see this jeep srt8 on the road again I passed one at night on tuesday and its light were INSANE, I want to get a pic of em, I am also looking out for a silver audi i saw last saturday afternoon with the LED DRL's, It looked pretty cool.