He previously played for the Highlanders and Chiefs in Super Rugby, Waikato in the National Provincial Championship, and New Zealand internationally.

In 2013 it was announced that he signed with Toshiba Brave Lupus on a two-year deal, beginning with the 2013–14 Top League season.

A six-month shoulder injury he incurred at the end of his 2009 Super 14 season with the Chiefs, prevented him from playing in the All Black side later in the year.

He was an integral part of New Zealand's World Cup winning side, starting several games, including every knockout match at left wing.

Kahui lived in Fuchu, Japan with Top League team Toshiba Brave Lupus under Australian coach Joe Barakat, with other New Zealand players Steven Bates and David Hill.