Does anyone have a recommendation on a good aftermarket dual exhaust kit that would fit on my 2015 Camry?

 

What engine do you have?
If you have a four cylinder, it is going to be a custom job. I don't know of any kits out there to convert single to dual for our cars.

 

Yes, I have a 4-cylinder. Would you recommend a dual exhaust or just leave as is with one?

 

I would suggest going with one. I have heard of some people having emissions/performance issues with two. I guess the lack of back pressure causes problems? I'm sure there is a right way and a wrong way to do it though.
If you are looking for performance and sound, I would look into deleting the resonator(s), high flow cat, and of course a performance muffler.
This is all my opinion though. There are some youtube videos out there that have audio on different Camry exhaust set ups.