Despite trailing mid way through the second half the Roosters fought hard as they have done all season to secure the title to add to the Minor Premiership already won earlier in the season.
The whole team stood up on the big day and were more than deserving on the big day.
Manly opened the scoring early on, capitalising on relentless pressure and a string of early handling errors and penalties enabling Taufua to cross over out wide.
The boys from the Northern beaches added a further two points not long after after receiving penalty goal right in front of the sticks.
Daniel Tupou was the first to score for the Tricolours, the flying winger out leaping the Wolfman after a beautiful kick from Maloney to level the scores.
After applying some pressure of their own the Tricolours took the lead threw a penalty goal to James Maloney after the visitors were guilty of throwing their hands in to the ruck.
The game was pretty well parked in the middle of the field until the interval with the Roosters going in to the sheds up by two.
Just two minutes after the break Manly were awarded a controversial penalty try when Mitchell Aubusson was judged to have tackled Lyon without the ball as he was in the process of scoring a try.
With the kick moved to in front Lyon slotted the extras and Manly were in front by four.
Continuing the ambush at the start of the second half, Manly scored a third soon after, Matai taking advantage of an overlap on the Tricolours right edge to put the Sea Eagles up by ten.
Refusing to lay down the Tricolours went devastatingly close through Sam Moa before scoring on the very next play thanks to a brilliant pass from Pearce handing Guerra his third try in two weeks.
The Tricolours then hit the lead when Sonny-Bill offloaded to Maloney who streaked away before finally linking up with Kenny-Dowall to score in the corner.
James Maloney converted five metres in from the sideline to put the Tricolours in front by two.
The Tricolours then put in a massive defensive effort, holding Manly at bay on a number of occasions before finally getting a chance of their own.
Maloney put through a grubber on the last play of the set which looked to go way too far before Jennings some how roped it in to seal the result for the Roosters.