After you modify the car, get your friend to drive the car into LSC (your friend might have to open it for you)
after you are inside go to the Xbox game store while inside the car. when you back out you will spawn inside the car and you will be able to Upgrade/sell and insure it.
Video-
after you are inside go to the Xbox game store while inside the car. when you back out you will spawn inside the car and you will be able to Upgrade/sell and insure it.
Video-
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