Isnt this inject stuff only for Nvidia?
Is it me or does Shift2 run better on latest Nvidia drivers- less popup on marbles, less "dark cockpits", less shimmer on chrome...?
Open the injector.ini and change the SMAA_PRESET mode from HIGH to ULTRA.
You sure you have v1.2? It should come with dx9 & dx10 folders in the archive :
http://mrhaandi.blogspot.com/p/injectsmaa.html
ive got it running again i think the stutter is down to nvidia physx at play which is forcing my ati gpu (which is not built for it) to do it insted of my cpu ... so over the weekend iam going to install a 9800gt for physx and see if that works better