What you will need
Two people
A motorbike
A car bought in the most recent update 1.13
Money to purchase the Karin Rebel ($3000)

Step 1: The person that is making the money needs to set there vehicle access to passenger *Hold back, scroll down and select passenger*
Step 2: Walk into your garage and drive out on any motorbike, as the drive animation end have you partner get on the back.
You need to drive fast enough so he doesn't put on his helmet. If he puts on his helmet repeat the process again
Step 3: Park outside your garage and get of the bike, your partner should stay sitting on the back. Walk into your garage and grab the car you wish to sell
Step 4: Drive outside your garage. Once the drive animation has ended have your partner kill you while he is on the back of the bike. When you spawn back
in have your partner get of the bike, you will see a car with a tracker on it. Find the car that has no tracker and drive to LSC
Step 5: Once you get to LSC park your two front wheels over the entrance of the door. Go onto your phone and go to the internet, click travel and transport
and look for South San Andreas Super Autos (SSSA for short). Scroll down until you see the Karin Rebel valued at $3000. Buy it and press Y to leave the internet
Step 6: Once you have bought the Karin Rebel phone your mechanic. While your on the phone to the mechanic, drive inside LSC. Highlight the Rebel and press A to order it.
Once the menu disappears, press right on the D-pad to bring up the LSC menu. Scroll down to sell and press A once. Look at the bottom right of the screen, you
will see a orange circle spinning, you must wait until that goes away before you sell your car. Once you sell your car, simply drive back to your garage and repeat the steps above.

Video