Fiore led home MW team-mate and fellow Nissan co-driver Alex Rullo
He said the win was "right up there" with his Supercars main game podium alongside Michael Caruso on the Gold Coast, and hometown Super2 win earlier this year.
"Bathurst is it," he said. "Awesome to finish up on top here.
"The Nissan Motorsport team, I've been with them now for five years and to see all them go crazy – Caruso told me they were all going crazy in the garage and obviously for Alex as well – it was awesome, just such a good feeling."
Rullo, also a Nissan PIRTEK Enduro Cup co-driver, said he wasn't surprised by the late drama, but admitted he nearly got caught up in it himself.
"I guess the same sort of scenario played out in my head also," he said.
"I thought we were going to get the [chequered] flag under the Safety Car, but obviously they let us run green, credit to the stewards for that.
"Obviously the smoke went up there and I was actually too busy watching that, I also went off myself. I kept it on the track and went on to take P2."
Chris Pither passed Jacobson on the run to the flag to take third, and displaced Dumbrell at the top of the standings, by 32 points.
Jacobson moves into third, ahead of Rullo, Brodie Kostecki and Fiore in sixth, with the final round on November 23-25, as part of the Coates Hire Newcastle 500.