tricky story I think he would be able to get a quite good time without these stuff though, but its hard to say since there are many questionable things throughout the run. it would be interesting to see a run by him without these "cheats"

in my experience theres a difference when you drive with offroad wheels, its kinda obvious;you get better handling when you drive on sand or grass ive seen that it has been discussed a while ago somewhere else, though

check the video by "madmax" on this forum,its a comparison of wheels. could be helpful too http://forum.adrenalinex.co.uk/index.php/topic,6744.msg159471.html#msg159471

hope that helped a bit