If i am in an offline race with a few ai's and they get a bit in font of me on the track they go all bubble like and lose their shape. any reason for this? thanks

settings on your pc - to improve the framerate it lowers the quality of the AI the further away they get - probably need to make the LOD (Level Of Detail) higher, and the LOD reduction lower

It's the dynamic LOD reduction feature doing it's work because your PC sucks (or you have the graphics up too high).

upgrade your system dude