Hello everyone, I come with an updated GT2 car viewer thanks to Leo's source code, with his approval.
The edit was done mostly by pez2k, with a quick fix by TheAdmiester.
Here's the changelog:
v0.2.4a TheAdmiester's fix
Fix quad data left over when loading a smaller car than previous
v0.2.3a
* Fix UV map drawing breaking when a model uses a UV Y coordinate
of 224.
v0.2.2a
* Port to a newer version of Delphi, to replace an unlicensed
gzip component with the built-in gzip library. Rewrite use of
gzip to use this library, which conveniently also fixes crashes
when scrolling quickly through cars.
v0.2.1a
* Reorganise the UI to maximise the size of the render window.
* Store the last selected path, checkbox state, and render
background colour in the config file.
* Resize the texture preview to the correct 256x224.
* Change the vertex colour to magenta rather than yellow, and
shrink the size on the texture preview from 2x2 to 1x1 to trade
visibility for accuracy.
* Remove the gradient and vignette from the render, as well as
the FPS counter.
Here's the download to the archive.
http://www.mediafire.com/file/hizjc1f27v79ah6/GT2CarViewerEdit_v024a.7z/fileThe source code to it is available upon request.
Here's an image to show the changes (background color is changeable in the .ini)

Happy car viewing!