If you are talking about the plastic cover that came with the GT appearance package in '07, no, you do not have to remove it. That is at least if you get a brace that fits a 2010. My 2010 has the cover and the brace goes over it.
Some say "not with use with plastic cover" and others say "for use with plastic cover" and then some say nothing which is what i am most worried about because that is one of the ones i liked the most but i don't want to get it and have to return it.If you are talking about the plastic cover that came with the GT appearance package in '07, no, you do not have to remove it. That is at least if you get a brace that fits a 2010. My 2010 has the cover and the brace goes over it.