It was damp for race three and with most opting for slicks, DW's Indy Al Miller and Gregg Gorski took the wet option and set the pace from lights out.
DW team mate Ben Caisley was into third, from Jon Field and Valour's Jim Booth, while Haydn Chance led the SR3's from Luke Hilton and Erlend Olsen.
The lead trio were well spread, but after seven laps 360's Jacek Zielonka was into fourth, ahead of a seven car train for fifth.
A couple of laps later Caisley was out, "there was no grip and the gaps had opened, but it started to dry and make progress. Then John Harrison spun and collided with me as he rejoined," he explained
Zielonka was now third, but the safety car was out for a couple of laps, and it all closed up again.
It was just a two lap sprint to the flag, with Gorski and Field chasing Miller for victory and an all US podium.
But Field had spun Zielonka out of the race after contact and appeared to have snatched victory on the line.
"I got a penalty after hitting another car, but I think we must race harder in the States," he reckoned.
So Miller got the win, "I had a flat rear for half of the race and then Jon got me at the end, " he said.
Gorski was classified second from Filip Svensson. "I had struggled for grip at first, but avoided the spinners, stayed cool and got the podium," Svensson explained.
Haydn Chance took the SR3 spoils again, fifth overall, " with Preen's SR10 splitting him from second placed Luke Hilton. "Slicks worked eventually, but Luke was ahead of me briefly," said Chance
"Haydn had just repassed me, then I made a mistake touched the kerb and spun, " Hilton added.
Mikael Bern completed the SR3 podium, with the penalised Field and Greenwood's SR3 rounding off the top 10.
So it all came down to the winner takes all final and it was Miller again with a flying start.
Gorski took Preen for second into the Hairpin, but Field and Caisley were close too.
After various exchanges, Caisley was poised to challenge Gorski for second, as Preen and Field had Svensson closing on their dual for fourth.
Caisley was through by lap six and edging closer to the lead. "Then the turbo went, I suddenly slowed and Gregg hit me," he explained.
Preen then arrived with nowhere to go, hitting the gravel hard and bringing out the safety car.
It was green again from lap14 with four laps to the flag. Miller was soon clear again, from Field, Svensson, Gorski and the reduced pace Caisley.
It was Miller's title, "the car was perfect and I just concentrated on not making any mistakes," he said.
Svensson took Gorski for third a few laps from home, but with Field penalised for track limits, he dropped to fourth as Svensson and Gorski completed the podium.
"I had got past Jon and then accidentally hit the pit limiter and he retook me," Svensson explained. "What a great battle," Gorski added.
Chance followed the top four SR10's to be crowned SR3 Pro 1500 World Champion, "they just swarmed me at the start, but once I got clear it was ok, " he said.
Caisley limped home sixth, followed by SR3 runner up Hilton. "I got held up a bit at the green flag restart, but what an amazing weekend," said Hilton on his Radical debut.
Bern was next home, but a post race penalty dropped him to fourth in class and promoted Peter Tyler to the podium.
SR3 drivers John Macleod and Amir Feyzulin completed the top 10, while Canadian Matt Graham became Pro 1340 Champion unopposed.
Watch back the final race on YouTube here…https://www.youtube.com/live/ES4mzqGxvB4?si=391-O5rtGYiFDtaG