the PIAA are more yellow, i have the classic garage ones and looking at them they look more goldish then the the IS300 foggies
I have hyperwhite(bluish tint) head lights and the classic garage fogs light up the road a nice yellow color...nice contrast with the bluish headlights and the yellow gold fogs.
I just go the 50watt blue diamond 885 fogs from classic garage, so i'm going to test them out to to see if i like the blue or gold better.
the complete light systems(PIAA, CATZ etc..) are always better then a bulb replacement in the stock assembly, but a lot more money.
there is probably bulbs out there that are better, but for the price you can't beat the classic garage bulbs.
if anyone knows of a place that sells yellow replacement bulbs let me know.