Take the XAs off and sell them separately. I would advise against modifying the 1LE suspension. I say this because if you have any issues with the car, such as blowing air bags because of hard cornering GM will not cover it. I can tell you first hand their out is the fact you modified the car. Your dealer can't help with that situation no matter how tight you think you are with them. And if you want to fight GM on it, be prepared to hire a lawyer.
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