The 2015 exhaust will fit on a 2016, cant speak for the outlander tho.

I just put the dual two brothers on my 16 renegade. My opinion two brothers has the best quality, finish fit and sound and of all that i have seen. It is not obnoxiously loud. it does get loud when you hammer down but cruising you can still talk to your passenger lol.

I would post a video but it keeps saying invalid file