You can retro fit powerfolds to your car - but not all cars have the required loom - if you have an orange/orane red cross wire behind the dash you should be OK to fit powerfolds if you are so minded. You would also need the powerfold window switch as well.
You can check the loom inside the car, remove the trim from underneath steering wheel and you will see where the loom from the door comes into the cabin, it may be covered in insulation tape in which case you will need to remove some of it at least to see the wiring colours. There are a lot of wires in the loom and you are looking for orange and orange /red.
