its better to use easywad. That program is included in zaz tools, if you don't have it yet you can download it here: [
files.vadertrophy.com]
when you have installed it, you open the program easywad and you select to associate files with easy wad and press ok
then you go to your main folder were the tracks are, you double click on a track, you go to maps, and the name of the folder will be most times ending on 2001 with track name before, there you insert the brawn garages and pitstands. It must be a PLUS track else it won't show up in the game !!!