In 2005, he became a regular in the Cowboys' 17, playing 21 games, which included coming off the bench in the club's first ever Grand Final, which they lost to the Wests Tigers. In October 2005, he was selected to play for the New Zealand in the Tri-Nations, coming off the bench in their 24–0 final victory over Australia.[11]
Huddersfield Giants
On 7 June 2008, after four-and-a-half seasons with the Cowboys, Faiumu was granted an early release from his contract to join the Huddersfield Giants.[12]
In 2009, he started at lock in the Challenge Cup final, which Huddersfield lost 25–16 to the Warrington Wolves.[13] On 16 October 2010, Faiumu represented Samoa in their 50–6 loss to New Zealand.[14]
In 2011 and 2012, Faiumu represented the Exiles against England.[15]
At the end of the 2014 season, following seven years at the club, Faiumu announced his retirement and took up a position as the Giants' Developmental Officer.[16]
