http://www.highresautoimages.com/ford/gtconcept5.jpg
If you want Ideas:
Wide-Body body kit
Intercooler
Color change
New Rims
Play with the vents alittle...
Do what YOU want...creativity is 90% of a chop.
Edit: This weekend I plan on doing this image with a widebody (my first). So thats where I got the idea.