Hey guys, As i have recently found out you can now duplicate Collectors Edition cars by using the new method of duplication but as i have also found you can now do this glitch free every time.

Note: Before you do this the car you are duplicating will be in the same car slot it was in in your friends garage.

Here are the steps:
1) Go to your garage and invite the person that is wanting the car duplicated to them.

2) When you are in the garage jump in the drivers seat of the car and tell the other person to sit in the passenger seat.

3) When steps 1 and 2 are done open up your browser (Driver Only) and go to the property website.

4) Once you are at the website go to the apartment building that you are in and select another apartment that is in that building.

5) Once selected buy the new apartment then quickly dashboard (So you don't get charged for the purchase.)

6) The person that was in the passenger seat will now be driving out of your garage but he/she will get stuck half way because of this there will be a slight delay..

7) Accelerate out of the garage and drive to the nearest LSC (Los santos customs) and upgrade/customize the car.
8) Drive to your garage and park your car outside, If you try to drive it in to store it you will get this message: "You do not have the corresponding DLC in order to store this vehicle."

9) Go into your garage and drive out in a random vehicle, This will put the personal car outside into your garage.

10) Go back into your garage and you will see that you have a empty spot in your garage (It is not empty, Because of you not having the DLC the game is not loading your car.)

11) Enjoy.

When you have the car stored in your garage you will not be able to drive out in the car you will need to phone your mechanic and request the vehicle, The vehicle will not be invisible when it gets to you it will look how it was when you customized it. To put the car back into your garage just drive to your garage and get out another vehicle.