When I studied MC FL-820S equivilents I found the NASCAR to be basically the same WIX construction as the Gold except ADBV was not silicon. I asked WIX about the various T-xx medias and could not get an answer. I concluded filtration is probably not much different than the Napa Gold which I don't think is 'great' but decent.
I bought and used one. I can get the FL-820S for less at Walmart otherwise I might use the NASCAR all the time.