1.Get a journey from pegasus and put it against your garage door
2.Go inside garage and once inside invite your friend to your garage and make sure he's in the vehicle with you
3.Once in the vehicle you want to sell drive out of your garage
4.You should spawn down the road
5.Once you spawn Take out your phone and call mors mutual once the menu pops up press Y and get out of your vehicle but make sure your friend is still in it. Once outside get rid of the menu by pressing B and Call mors mutual again. It should say that the vehicle you drove out is destroyed buy it back
6.Hold Y and throw your friend out of the vehicle
7.Go to Los Santos and put your 2 front wheels inside and buy a Karin rebel. Once you do that call your mechanic and when the menu pops up drive inside Los Santos
8.Once inside Los Santos the menu should still be up, request the rebel you just bought and quickly press right on the D-Pad
9.Now go to sell and press it once and wait for the small gold circle in the bottom right corner to go away(Bypasses 45min wait). Once the circle dissapears sell it. If you go back to your garage the car should be in the same spot
Hope it helps