Tahi attended Brigham Young University as a freshman in 1999 and led the team that year in rushing with 445 yards before taking a two-year leave for a mission in Jacksonville, Florida as he is a member of the Church of Jesus Christ of Latter-day Saints.
Tahi was an undrafted free agent out of college and signed with the Cincinnati Bengals in 2006, but was released on final roster cuts and became a member of the team's practice squad.
He also had 16 receptions for 37 yards, most of which came on one-yard dumpoffs in the flat, a favorite play of Brad Childress and the West Coast Offense playbook.
[3] Tahi was raised in a family that are natives of Tonga, but he was born in California before moving to Utah as a child.
After retiring from football in 2012 Tahi became the running backs coach for Granger High School in West Valley City, Utah.