It's kind of hard to tell but it appears to be a factory exhaust with modifications. The previous owner may have removed the mid mufflers and replaced them with Race bullets of some kind. Also they have removed the rear muffler which I could imagine is pretty load and a drone on the highway speeds. If you want to make it quieter, I would suggest re-installing some factory rear mufflers.
Factory should look something like this:
![Bicycle part Nickel Auto part Composite material Gas]()
Factory should look something like this:
