The brothers and their team have been flat out every night this week rebuilding the car for this weekend.
“We basically had to cut the front off it and rebuild it,” Ethan said.
Daniel Cook went from No.6 on the grid in last weekend's New Zealand final.
“He was ready for a podium, I reckon, until he was hit from behind,” Ethan said.
“He dealt with it really well.”
Ethan Cook started from No.13 on the grid.
“I had two firsts, a third and a fifth in four of the five qualifying heats, but in Heat 2 I had battery and alternator failure, so that cost me.”
Despite starting so far back in the field, he finished fourth.
“I felt really good about that performance,” he said.
“I was stoked. I was ready to pass into third place when I ran out of laps.”
On social media it was described as “an amazing drive”.
The brothers posted on social media after the New Zealand titles: “A massive congratulations to the podium getters after a wicked weekend of racing.”
Ethan said he and his brother were looking forward to racing on the Kihikihi track this weekend.
“I haven't raced on it before but I hear it's good.”