I have not seen any aftermarket rear bumper protection, other than full tube or plate bumpers.
The front, the main company would probably be LP Adventure, but they are pricey $$$.
The window guards are well worth it IMO. I got them after about a year of owning the car. Cant say that I noticed any increase in noise, but that would be semi subjective as some people are more sensitive than others with those kind of noises.