The 4 options are:
-static [worse items]
-normal [what wifi and grand prix is set on]
-Aggresivs [more blue shells, lightning, etc.
-None [self explanatory]
The host can set this before the race.
If you've set your forum layout so that the newer posts are first go to the last page at the bottom are the original rules. please look at them.
But the rules have changed a little bit. check daily updates for that.