There are a few options on how you want to use the credits. The V6 cars, or 3800 cars for that matter, require 4 credits to unlook that particular year and model. If you only want to use enough credits for 1 car that will be vin-locked to the tuner it is only 2 credits. Say you want to add support for a 2000 GTP. You can either lock it to one vehicle for 2 credits OR you can tune unlimited 2000 GTPs for 4 credits. Either way you can tune as much as you want, you dont have to use credits to make a change each time. Adding support via using your credits on different vehicles perminently locks each selected vehicle into the cable.
