Open your car in Photoshop. Flatten the image, and go to the File menu and select "save as." Under file type, select "targa" (.tga) and save it in the "imports/exports" folder in your N2003 game folder. Once you've done that, start your game. Go to the mod you want, and click on "opponent manager." Click on "new." You will be asked to name your file, and select what car it goes on. I normally name mine something like "71skotnscs" or something like that. You will want to select Chevy. Once that is done, you should see a rotating car. Click on "import," and find your .tga file in the list. Hit OK, and your paint should be on there. Sure hope I didn't miss anything, but give that a shot.