Remember, aftermarket bumpers are designed for off-road abuse. Getting in an accident on the street, with a much sturdier bumper (front or rear) will result in forces being directed to the vehicle differently.

Crumple zones are there for a reason, safety. The stock bumpers are designed to absorb energy, aftermarket bumpers are not.

Had you had aftermarket bumpers on your Xterra in your accidents, you may have wound up with much more expensive frame damage, that may be beyond repair.

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Regards,
Ian