I’m struggling to find where this connector goes or what it is
 

Hello, I just converted my Impreza to be manual from auto, doing finishing touches before startup and I cannot find where this connector goes or what it’s for. Please any help would be greatly appreciated.
https://cimg3.ibsrv.net/gimg/www.sco...c33f98938.jpeg
https://cimg4.ibsrv.net/gimg/www.sco...83e8ec4a8.jpeg
https://cimg5.ibsrv.net/gimg/www.sco...fb5faf0b1.jpeg
https://cimg6.ibsrv.net/gimg/www.sco...fe46eb791.jpeg
https://cimg7.ibsrv.net/gimg/www.sco...e00cbfa86.jpeg
https://cimg8.ibsrv.net/gimg/www.sco...67c85f6fd.jpeg
https://cimg9.ibsrv.net/gimg/www.sco...80d460428.jpeg
https://cimg0.ibsrv.net/gimg/www.sco...a12999eb3.jpeg

Not all Imprezas are equal.
It would help to know the year and model info, whether LHD or RHD (looks a LHD) etc.
What you are holding looks to be part of the "bulkhead wiring loom in the engine bay" with the main 2 connectors to the engine harness which would suggest a non turbo model.
The white (classified as clear) 4 pin connector with 3 wires may be for an oxygen sensor............ but only guessing without further info.