You can get these code here!
   • Mario Kart DS ~ Ultimate AR Code Coll...  

i made this code quite awhile ago. it makes it nearly impossible to drive on shroom ridge or GCN mushroom bridge lol! this code also control's other various objects speeds, like. the snow balls at DK pass. the pinballs at waluigi pinball. the trees at luigi's mansion. luigi's blimp at gba sky gargen and luigi's circuit. the pokey's at desert hills, the blue shell and red shell speed. and more! Enjoy! XD

(codes by Dave)