It is one of the oldest clubs in Manawatu, and produced former Munster fullback Christian Cullen, Bristol number 8 Dan Ward-Smith, and former Black Ferns captain Farah Palmer.

He played alongside players of the calibre of Ben Atiga, Jimmy Cowan, John Afoa, Stephen Donald and Sam Tuitupou in the 2003 U21 RWC against Australia.

Mafi was also part of the 2005 New Zealand Sevens squad which won the World Series, and played alongside Maori captain Liam Messam, and All Blacks Joe Rokocoko, Isaia Toeava and Rudi Wulf.

Mafi's first appearance in a Munster jersey came during the close, hard fought win against Leicester Tigers at Welford Road in Round 1 of the 2006–07 Heineken Cup.

Mafi was only on the pitch for a few minutes, but during that time he found himself on the wrong end of a trademark hit from Fijian centre Seru Rabeni.

Mafi himself scored a vital try away to French side Clermont, which secured a crucial losing bonus point which safe guarded Munster's passage to the quarter-finals.

Mafi's move to French Top 14 side Perpignan was announced by then-Munster coach Tony McGahan in an interview on 22 March 2012.