Oh, they sell like crazy in USA, trouble is Berk is always caught offside, now they don't have flanges again, 2nd time this year, first in March, huge delay because of the strikes in LA ports, 2 months delay to get the container...
We're going to stock them on the next batch, with the age of the 350z and cats going, but also with the not so loud 370z exhaust systems, HFC are the cheapest / nicest option out there.