rear bumper is a piece of pi*s to change mate, i have put the 182 bumper on mine with a twin exhaust, but i think if you cannot be bothers to the exhaust, get a 172 rear bumper.
also the front bumper is alot more work as you need, front bumper, front wings, side skirts, front arch liners, and spacers for the front wheels.- ( not neccesary but recomended)