There is a reflective material inside the tail lights sometimes it doesnt focus the light exactly right. Might be warped a little or something.
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2013 5.0, Black, Auto, Procharger P1SC stg 2, 4.13'' pulley(8 psi), JMS bap, 3'' x pipe, Circle D 3c, Kooks axleback, BMR control arms. 593rwhp