On some Add-On cars, tuning disappeared, there were only: wheels, lights and paint
Welcome to the wonderful world of MODKIT_ID's
@ReNNie read my PM i sent you. I also just figured out a way to add more tuning parts for cars once you reach your max number which is 255 cars with tuning parts using my carcols.ymt method
@Willief23 Yes, I'll reply later to you in dsawdsaw's thread
@_Jason_ long story short:
The game only holds 255 modkit_id numbers in carcols.meta and carvariations.meta and stores them in 8 bit (so, using numbers like 77777 actually doesn't matter).
When adding a dlc you have to make sure there are no double references in the meta files as then the tuning stops working.