Those could have been made by any one of 100s of manufacturers that produced 4/2s back in the 70s and 80s.. and possibly more recent too..
Very few of them put their brand on them.. and some of them had distinct characteristics about them...
But those don't seem to be different than most of the others..
My first thought was they be stock headers with slip ons.. but then I noticed they didn't have the curved bend in the front pipe that stockers do.,.

Build it the way you want it ..... then learn how to ride it like you own it..
www.lowridersbysummers.com