BA has one knock sensor, BF has 2. If you use a bf pcm you need the second sensor, if you use a ba pcm you only need one.
If you're putting a turbo engine into a na car, you'll obviously be using some type of intercooler and exhaust to suit the turbo. You'll also need some type of intake for the turbo. You may need an upgraded fuel pump depending on the condition of the stock one. There's oil and water lines for the turbo, there is likely plenty more things to list, but you can get to reading to see what you have and what you need. Depending on what you use, you may or may not need a tune.