Mr Manu, of Auckland, received $5000 from the foundation and the Celebration of a Century Cup.
The 23-year-old tenor said he was "really happy" with the win.
"It was a lot of hard work."
He needed to be in Auckland to rehearse for an opera today and planned to travel to New York and London for auditions later this year — "To cast my net out and see what I get back."
Runner-up Ms Wilson (22), of Auckland, received the Val Braumann Award of $2000 and the Chambers Family Tray.
Soprano Madison Nonoa (23), of Hamilton, was third, and received the Hadley & Robinson Award of $1000.
Judges Choice Award winner soprano Laura Loach (28), of Timaru, received the Queen Rose Retirement Home Award of $250 and the Gaelic Society Trophy.
The audience of about 130 heard the 10 finalists sing 20 arias.
