se to st

I have a 2017 Ford Focus se hatchback that I am trying to turn into a st I am planning to buy a st motor and transmission in a couple days and I’m wanting to know if there is anything different from the se to st that I will need to change other than the manual transmission axle

Right now I have a 2015 focus se 2.0L (Naturally aspirated) 5 speed manual. I want more power than my car is putting out. I was wondering what the cheapest way to get st performance out of my se. Engine swap? Buy and st turbo and piping and keep my engine? (I'm planning on putting better brakes...