No it wont look off balanced. There are several members here that have done just the front. I am going to do just the front because I personally like the non-m sport rear bumper better. Not so transformer-ish looking as so many cars are starting to take after. The side skirts if you draw a line to the end of the wheel well bottom actually lines up with the M-sport as well. The M-sport is lower on the front end but not where it meets the wheel well.
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