I use to go to Car Tenz all the time when Carles and Wei owned it. They use to always give my friends and I good deals on stuff. I was also the one of the first people to get the Apex-i N1 for my '00 RS as they got 1 prototype in and sold it to me for $375 brand new in the box.
I went in there a couple months ago with my girl and they didnt have anything in stock and you could tell they had sold. Charles use to be stocked to the gills on things like rims, exhausts and other accessories like air fresheners. They didnt have anything when I went, but maybe things have changed since then.
As for the one in Fairfax Charles and Wei were partners with this rich kid that had a TT Supra a BMW M3 and an AMG MB. From what I heard they all sold the business and he moved to Vegas and Charles and Wei sold to focus on the Clubs they own. This is just what I heard.