After spending time with the development squad in the early part of the year, Mapapalangi made the Manawatu squad ahead of the
2015 ITM Cup season and scored 3 tries in 9 appearances during the campaign. His performances attracted the attention of
Super Rugby franchise, the who invited him to train with their wider training group during the
2016 Super Rugby pre-season. The
2016 Mitre 10 Cup was less successful for both Mapapalangi and his side. The Turbos finished 5th in the Championship table while he made 7 appearances of which only 2 came from the start. On 7 August 2017 Mapapalangi signed for
Leicester Tigers in the
Aviva Premiership. He made an impressive debut for Leicester on 16 September 2017 as a replacement for
Joe Maksymiw in a 24–10 win against
Gloucester at
Welford Road. His first start came the next month in a 28–17 victory against
London Irish at the
Madejski Stadium. On 15 May 2019 he was announced as one of the players to leave Leicester following the end of the
2018-19 Premiership Rugby season. ==International career==