Originally Posted by Irelands child
Just to satisfy myself, I just crawled under my car (it's on ramps, or no way
) and there the stamp is right next to the seam along with what looks like a part number. Mine are 50 Series plus I knew that they were FM's because I took 'em out of the boxes myself and welded up my own exhaust.
I've tried welding (I have never been taught ANYTHING about welding) and I seem to just melt stuff. So I have others do it for me