Winning both legs in Otago earned the Masons maximum points toward the five round NZRC series, and the defending NZRC champions also set the quickest time in the power stage to earn three bonus points. Richard Mason, in the overall NZRC drivers' championship, now has 90 points, 20 points ahead of Gilmour in second place.
Mason said Sunday's stages were "a bit heart-stopping at times", with the fast turns and twists over the Otago crests, but they had managed to survive the challenges posed them.
The victory means Mason is one shy of triple New Zealand rally champion Neil Allport's record of 22 round victories.
NZRC points
Richard Mason (Masterton) 90pts
Emma Gilmour (Dunedin) 70pts
Alex Kelsey (Coromandel) 51pts
Matt Jensen (Christchurch) 48pts
Chris West (Timaru) 44pts
Sloan Cox (Rotorua) 22pts
Kingsley Thompson (Auckland) 21pts
Marcus van Klink (Kaiapoi) 20pts
Matt Summerfield (Rangiora) 12pts
Dean Bond (Balclutha)10pts