how to download and put cars into the game

[photnot]

hi,
     i'm having trouble downloading cars and then putting them into the game
     i've got nfspu or on computer aka porsche 2000 i want muscle cars but can't get them on any help would be seeked and used
:bigthumb::bigthumb:

[rapzeh]

sorry but I don't know , I hope I won't go offtopic whit MY problem , but it looks like the right thread
I have problems whit some of StYLiZeR's mods for NFS:MW , like the new Proton one (that car excites me more that porn right now :p )
so , in the zip file there's only a ".exe" file , when I install it there's no difference in the "ADDONS" folder or when playing the mod. So... how do I use these mods , especially , the proton one http://www.nfsaddons.com/nfsmw/cars/Nissan/1463/
(I'm already using other mod cars , but none that replaces the SL65)