I came across a couple of visual enhancements for GRID which really beef up the graphical quality.
A video showcasing these mods of course wasn't far behind.

Shot and edited in a day using FRAPS and Sony Vegas 8.
Modifications by BeetleatWar1977 & Dargos.
Music by Hybrid.

Rig:
HD3850 512
Quad Q6600
4 GB DDR2 @1066

~40fps @1920x1200, everything maxed and 4xMSAA.
Using Fraps cuts that number in half.