Vault Boy 101
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Right ive completed nfs carbon and to defeat kenji i used the RX-9 becuase kenji was my first boss to fight so i modded the RX-9 with nitro and everything else i unlocked. Or if he's your second or thrid boss to fight just buy the most expensive car in the car lot and you should be able to defeat him and mod it up with nitro.
gallop
Nfs Carbon Kenji