I would suggest looking at youtube for xv rear wheel bearing change covering you year model .
Video give you far better basic guide .
Technically it simple nut and bolt job swap out a complete hub bearing assembly but corrosion can make them difficult slow process without good air tools .
Buy a quality bearing assembly preferably japanese, not the lower priced stuff and none of the german sounding brands that actually chinese garbage .
Prodrive kit for newage wrx changes the secondary cat for a sports cat think you then get a cat back ecu tinkered and a silicone Y pipe under the intercooler. The secondary cat is directly after the down pipe. Did you get a certificate as proof? The upipe is probably worth doing if your keeping long term cause it will be much cheaper than the damage it would cause if it gives up saying that I had 2 wrx’s with it in place go over 100k miles without breaking suppose depends on how you drive it and how the car runs.
I have bought two downloaded manuals from the net and they are 4000 pages long, and I can't find the page I want for changing the rear wheel bearings on my 2016 XV. They are a rip off because they are for US/ Canada models. Doe's anyone have the info on changing rear wheel bearings on my model? Also is there a 'Hanes' type manual available for the model. I realise already that you can't get one for the diesel engine model.