Looks like a knockoff of a PM Tuning or JL Leftie.
Basically, it's a 1980's tuned pipe. Really loud, minimal benefit. You can get a bigger and better power curve off a modern box exhaust and it'll be a heck of a lot quieter, too.
If you were a clubmate, I might give you a few bucks for it just so you'd upgrade and I wouldn't have to listen to it while we rode.