Based on the FB page, the support email is [email protected]
However the website link points back to American Muscle.
So I'm thinking it's another AM brand...
Although the actual country of manufacture is a separate matter.
A few people have replaced the headers in the UK
It is worth about 35bhp in total, but you have to bare in mind, that Ford have fitted something developed by a village idiot to be honest on the RHD version (Poorly welded chunk of metal, missing pipe and what looks like a hammer dent to work...