To sir hamas123,
i was able to finished the carrer mode for nfsc, but their are races that i skip, since im so eager to finished off darius.
for me the car that i was able to defeate darius are the following: (in first car that i use to the latest)
1. first i used the viper, it has a very good acceleration (as in very good). in order to beat darius at the canyon duel, you must speed up at the start, run on the left side of the street and then overtake him at the first curve (left turn) dont worry if you will be deducted with 5000 points for bumping
his side, but it surely helps in slowing him down a bit and be able to overtake him. after you have overtaken him, make sure that he will not be able to do this also to you, try to block his way if he tries to overtake you, you only need 10 seconds to be infront of him and wallla its all done you beat darius big time.
note: don't be frustrated if you were not be able to overtake him on the 1st, 2nd or 3rd try because i beat him on the 11th try.
2. and then i use corvette, this car has a good acceleration also. strategy used is the same as with the viper.
3. the 3rd car that i used is the mclaren, i was able to beat him by tailing him all the way (no matter what i do i can't overtake him, maybe its slower acceleration than the viper).
hopes this helps.
im planning of beating him using ford GT / gallardo and tuner car like mitsubishi evo9.
ill keep you posted if successful