Ok, so i just bought my g35 coupe 6mt last monday. The wheels (19") on it were stained this black which doesnt come off. Some ppl have told me its from acid cleaner that is used at some detail places. So im going to exchange them for chrome wheels from a place called OEM Rims out in california. First off has anybody heard of this company and are they reputable. And Second the lady there told me i have to keep my valve stems because they are part of the tire pressure monitoring system, Is there anyway to get those chrome like the rest of the wheel or do i have to stay with the ugly greyish color.