A lot of people arent fans of cannons.
I think it would be more performance-boosting if you upgraded the exhaust piping from the cat convertor to the end, and then put a cannon on, but a LOT of people just get it welded onto the end of the pipe, its really up to you and how much money you have to spend.
In my opinion, 2.25" from the cat back, and put a nice sports muffler instead of the stock muffler at the rear with any exhaust tip of your choice