With Silverstars, some people love them, some were disappointed. Of course there are expectations of HID with these bulbs. Don't get your hopes up high with these. I just see it as headlights bulbs that aren't blue and aren't yellowish either. Although they are on the pricey side, I think they're better than standard halogens and they've lasted me quite a while...

I did hear that there is a difference in light output between the 9003 and the H4's. I'm not positive about this, but I think that somone else here can confirm it.