I noticed an ebay ad for new 4-4 pipes sold by 4into1, $1,995 with free delivery, the ad said made by full classic exhausts and do not mention busso, but country of origin is listed as Italy. In their place, I would also change the name and concentrate on wholesale customers.
There are also ads for what I call the 341 mystery pipes. during the covid shutdown I got a set from cmsnl but have never found out where they are made. The look awesome but don't sound awesome. Mine are acceptable with the exhaust tips removed. I may open the tips up like we used to do in the 70's while saving up for a Hooker Header.