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As for wheels, you can put wider wheels on but beware to get the right offset (stamped on wheels), you may also have to be prepared to cut the bumpers and do some hammer work to the wheel arches.
You can retrofit the 4x4 bumpers, be aware that the front cross ones require much more work and require the lights and trims to be purchased (not cheap and certainly not common)
Rather than fitting 4x4 bumpers, you could modify the existing ones by, for instance, cutting the lower lip off and attaching an aluminium plate and, perhaps some slots with grillwork?!?