Found one in my area on Craigslist, has 30k miles on it. Owner wants $90 for it.

I'll also have to have it installed by someone (not sure what that will cost.)

Is it possible (lol im not super car smart yet) to put it on my v6,

and would it be worth it?

 

If your going to convert your V6 to true duals a better option would be to go to New Car Takeoff and get their kit for $314 plus shipping. It includes the Pypes X pipe and mid pipe, plus muffler hangers for the drivers side muffler. Plus a pair of NTO GT mufflers.
I did esentially the same thing 3 years ago, but I bought my X and Mid pipes from Sumitt racing for $200 with free shipping. Got the hangers for $30 a pr and got some one week old 2007 GT mufflers for free. I cut out the bumper and installed the hangers muself, but had a local muffler shop cut the down pipes and install the new system for $50. I have been very happy with the setup.
FYI I saw a good tip for installing the new hangers. The bolts on the existing hangers on the passenger side are self tapping, so if you remove them you can use them to tap the new ones on the drivers side instead of buying a tap like I did. Then you use the bolts fron the new hangers for the old ones on the passenger side.