Sorry if this has been previously posted on here and I'm just slow in this world and just noticed it...
Pretty cool if you haven't got it!

http://driftmods.net/forums/index.php?topic=1473.0------------------------------------------------------------------------------------------------------------------------------------------
Open X_GTWALPHA.psd included on the download;

Now create a layer and fill it with a cold colour so you can see wireframe(optional);

Now aply every stickers you want and don't forget your driver position for front window;

Now on left window stickers you have to Flip horizontaly every stickers(i recomend do one per time);


Everything done, now hide Template key, textures(if not used), Templates and the layer you created to see better the wireframe;

Now all you have to do is save the file, so go to file->Save as...
And select D3D/DDS (*.DDS;*.DDS);

And the select DXT3 mode and click save and save the dds file in you data/dds folder from lfs;

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I've been testing it and it does work online too so no getting kicked when entering etc (Does include a vob mod to install for the new DDS files to work/load).
Mod is created by Nagata on the DriftMods website.
(If it doesn't work (Like mine didn't) save onto the desktop then put it in your DDS file manually)