Whatever you think looks better. My 4x4 doesn't have one because I was always ripping it off or almost ripping it off, my 2wd does just becuase I personally thinks it looks better. As far as mileage don't think it will change much.
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Mine didnt come with one but its also lifted and i use my truck to bog with and run trails so i think it would get ripped off any ways but u guys r saying 18 like its rare? i pull 20mpgs as long as some jerk doest make me mad or im out hot rodding
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