Dirt 2 & NFS:Shift mods?

[metalmackey]

Ello Guys

Are there any good mods for Dirt 2 and/or Need for Speed: Shift? If so, how do they affect performance?

Ta

 

[Jericho.u.k]

I have heard of a few mods for both games but i could not tell you what they do to affect performance.