Easier way is to download the tga file you like ( lets say it's a Camaro tga ) , making note of it's file name, then moving it into the import/export folder in the game. Then go into opponent manager, click on the new button, box posps up, pick chevrolet, then give it a name ( Say like 41_Toms) from there you can then import your tga ( remember the file name ) file onto that blank car, ,then you'll have to fill out the driver info, next do the pit crew the same way. Save it and bam, it's done