Masuoka's most notable achievement was his back-to-back successes in the Dakar Rally in 2002 and 2003, only the fourth driver in the event's history to win in consecutive years.
[2] Throughout his career he has been employed as a works driver by Mitsubishi, typically driving a Pajero.
During his Dakar career, he won 25 stages, putting him fifth in the all-time list for the car category.
[3] Masuoka currently resides in Iruma, Saitama Prefecture, with his wife Chiaki and son Shoichiro.
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