Replaced regular sylvania 9007's with silverstars. The difference was barely noticable, and certainly not $50 noticable. Later i bought some el' cheapo h-1's off Ebay for the fogs. Silverstars are 3800k while the fogs are 4000k. Much better color and brightness from the fogs, so i'm hunting for el'cheapo 9007 at 4000k now. But even before i got the h-1's, I did a side by side comparison between regular halogen and silverstars, and was pretty disappointed. But of course, that's just my opinion.