Muffler Question

[72step]

This weekend I got a deal on some headers and complete exhaust from a guy who was parting out a truck. He sold them to me as "Flowmaster" mufflers but I was looking after I got them, and they don't say "Flowmaster" anywhere on the muffler as they have the flowmaster script on the actual muffler as I was looking on Jegs at the images of the real flowmaster mufflers. They look like, and are shaped just like flowmasters with the weld along one side of them, but what could the really be? Either way I'm happy because they are way nicer than what's in my truck now-cheap turbos. Also the headers mount to the exhaust with what he called a "ball mount"-- I guess they're not supposed to leak with this type of mount. I hadn't heard of that in the past. Thanks any info would be appreciated.