Well that doesn't happen with me.
OK, i'll check into it
but with Mclaren, you just install the files, NOT edit the .gen
You're not reading what I am saying.
I installed the McLaren files alone. From the attached files on the previous page. No editing. Went into the game, selected the McLaren and it spat up motor dialog errors, took a while to load anything in the rotating display and ended up with parts of the model missing.
The only editing I had done was to restore the default lines so I could get the cars back, (as if I hadn't installed the arms) or if I went online, anyone driving a McLaren there would have been a good chance my game would have crashed, because of the motor error dialogs that popped up.