I can't find a cat back exhaust for my 2016 Ford Focus SE Hatchback, can anyone

I can't find a cat back exhaust for my 2016 Ford Focus SE Hatchback, can anyone - 1

Legally you can't mess with an exhaust system until the car is at least 5 years old. That is why you can't find one!

Not into factory warranties, are you? Because the moment you turn a bolt on it, the warranty is gone forever.

Borla makes two catbacks for the Non-ST Focus. There's a touring one, and a lounder S-Type

https://www.borla.com/products/focus_catback_exhaust_stype_part__140454.html
https://www.borla.com/products/focus_catback_exhaust_touring_part__140400.html

Magnaflow makes one

https://www.magnaflow.com/automotive-performance/exhaust-systems/products

Flowmaster doesn't seem to make a cat back for your car.

I'm not sure what your goals are but it's not going to sound particularly fearsome, nor are you going to gain much in the way of power.