After some more nice & friendly hate messages, screw the haters, here is the basics:
I found this method out myself without the help of others, so i don't need to give credit to anyone.
First the car you want to rip the mod parts from, needs to be saved into Mike's home garage or Trevors. Then you quick save. 'doesn't matter if you quick save inside the garage or outside'
Now you export it to usb, open it with the save editor, click blocks, extract PSIN.
Open that file with a hex editor.
And open this spoiler for vehicle hash info.
Lets say you want the Adder.
The Vehicle hash is the hex code B779A091 'only copy whats after the 0x mark'
Your current saved vehicle is an Zentorno with the wing option on it.
search for AC5DF515
Find it and replace it with the Adder hash code. Find the next one and replace it again. After all have been replaced save it and import that file back with the save editor/block/replace old PSIN.
Or replace all of them at the same time, Tip from Sprue:
Boot up and go to Mike's garage again.
Bam, Adder with zentorno wing/all other upgrades.
Now the thing is, every time the first car value appears in the hex, its for another part of the vehicle. So i need some more testing. So far i have added car wheels on bikes to.
There are 4 set values i've found so far. Toy around with it and see what you can find. So far i have added all parts you can think off, bike wheels on cars and the other way around.
I think you can pretty much do this with any of the safe-house saves. Maybe even the stripclub location but i haven't tried that one yet.
Keep in mind, i just figured out how this works. I will update within a few days with a full guide @ the ofline section.
Now you can get them online as you can see with my Akuma-Double T hybrid:
However you cannot store them. Once stored and you leave the garage, all mods will be gone. Also going into LSC with those modded vehicles, will freeze your system.
Fist combinations i did:
Akuma mixed with Double T fairings:
Adder with bike wheels and Double T fairings:
Have fun fooling around.
Free hex editor program:
Have fun fooling around, And don't forget to post your creations!