Career
He was signed by the Cincinnati Bengals as an undrafted free agent in 2006. He played college football at Brigham Young University.
Tahi rushed for a total of 5,700 yards and set a state record as the all-time leader in rushing yards and for rushing touchdowns. Tahi returned to Brigham Young in 2003 and had a career-best 872 yards rushing from scrimmage as a senior and scored 8 touchdowns (6 rushing and 2 receiving).
Cincinnati Bengals
Minnesota Vikings
Tahi signed with the Minnesota Vikings on November 22, 2006 to their active roster from Cincinnati"s practice squad.
Tahi saw his first significant playing time in 2008. During that year, he was listed number one on the Vikings depth chart and played several games at fullback blocking for Adrian Peterson as well as playing on special teams.
Tahi signed a $1.4 million offer sheet March 19 with the Cincinnati Bengals, but the Vikings matched the offer and re-signed him on March 27. He was re-signed to a one-year contract on April 13.
Jacksonville Jaguars
On May 6, 2012, Tahi signed with the Jacksonville Jaguars.
On July 27, Tahi left Jaguars training camp for personal reasons and was released later that day. Tahi was raised in a family that are natives of Tonga, but he was born in California before moving to Utah as a child. Tahi is cousins with former Brigham Young University and former NFL fullback Fui Vakapuna.
After retiring from football in 2012 Tahi became the running backs coach for Granger High School in West Valley City, Utah.