Before becoming a professional driver, Yoshihara worked at a car dealership, a telephone company, and a trucking service. Drifting interested him but he saw little economic opportunity in the sport. That changed in 2003 when he was offered a spot in the D1 Grand Prix's inaugural United States round. He had no previous competition experience and had never competed in a drift event, yet he qualified and finished in the top half of 32 competitors. Shortly after, at the Drift Showoff at Irwindale in California, he took second place overall. He ended that maiden season with multiple wins, which led directly to an invitation to the 2004 Formula Drift Championship.
Yoshihara's 2004 Formula Drift season placed him second overall in the championship, and he earned recognition as the driver with the fastest entry speed at every round he entered that year. He finished fifth in both 2005 and 2006, then third overall in 2007.
In 2008 he drove a factory-backed Pontiac GTO for RMR Racing alongside Rhys Millen and finished fourth in Formula Drift overall, while also placing second at the Red Bull Drifting World Championship. The 2009 season brought development difficulties with a Falken-backed Lexus IS350 that eventually had to be retired, and he completed the year in an 11th-place finish driving a team-built Nissan 240SX. He remained with Falken for 2010, finishing fourth in the championship in the modified 240SX.
The 2011 season was his career high point. Continuing with Falken and the Nissan 240SX, he won the Formula Drift Championship and the Tires.com Triple Crown award. He drove the same 240SX through 2012 and 2013, finishing seventh and eleventh respectively, before switching to a 2014 Subaru BRZ for the following season.
He continued competing in Formula Drift through 2020, with a sixth-place championship finish in both 2016 and 2017 among his better later results.
Yoshihara's involvement in competition extended well beyond drifting. In Global Time Attack at the Super Lap Battle final event, he drove an Evasive Motorsports Toyota 86 to first overall and the Unlimited RWD class win in 2019, after earlier Unlimited FWD class wins at the same event in 2014 and 2015 (the latter setting a new FWD course record).
At the 2020 Pikes Peak International Hill Climb in Colorado Springs, Yoshihara drove the Evasive Motorsports Toyota 86 in the Unlimited class. After mechanical trouble prevented qualifying and left him starting last, he recovered on race day to finish first in the Unlimited class and ninth overall with a time of 10:05.006.
He also competed in the Lamborghini Super Trofeo Asia series, finishing second overall in the LC Cup in 2019 and second in Race 2 at the 2018 World Final.
Yoshihara has served as a drifting judge for the Professional Asia Drift Series and related events in Malaysia, Singapore, Thailand, and Dubai since 2009, and as an instructor for the International Drifting Academy in 2011. He starred in the web series Behind the Smoke, a documentary following his 2011 championship season produced by GTChannel, which won a Bronze Telly Award for Online Video Reality Show in 2012.
Yoshihara's career represents the breadth of competitive disciplines available to a skilled drifting driver: from D1GP in Japan to Formula Drift in the United States, from Gymkhana Grid to Pikes Peak, his record demonstrates consistent competitiveness across very different formats. His 2011 Formula Drift championship stands as the centrepiece of a long and varied professional career.
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