Mk's 3.8 users look here
To retrieve codes for Gameshark 2 v2/ Action replay 2 v2 or Codebreaker 4 or newer models.
For everyone who uses one of those devices to create their hybrids.
Go ahead and use MK's to to create whatever vehicle you can imagine building. Changing whatever parts you wish, and even exporting your vehicle to edt the .ini file to adjust settings if you wish, and importing them back into the edit program to save those changes.
After you have finished building whatever hybrid you have created (and feel free to play around...since using this method, you can't screw up your file)
Now right click on the car you want codes for and first go to set code base, and click on the appropriate device:
GS2 - for the gameshark2 v2 or Action replay2
CB4 - for codebreaker 4 or higher
For the first device you can also select the region:
US - North American NTSC basecodes
JP - Japan NTSC basecodes
EU - Pal basecodes
Now close that window and the program will give you the proper codes for the game and device you need.
Ok, now right click on any car you want codes for and go to List coded car, and another window will pop up with all the codes for that vehicle listed(parts as well as settings), so you can easly copy and paste whatever you want. This way you do not have to ask people for every single code you require.
Post, e-mail or message if you have any questions. I am always here to help.