Unlike the majority of the AP4 cars that are either completed or currently under construction Davies is not getting any factory support from Toyota New Zealand.
"We have got no sponsors - we just love the sport," he said.
"I think most of the other cars have got some good backing but we are pretty much doing this off our own back."
Davies says there has been limited joint work with Chambers and the two Toyotas will be quite different.
"Both cars were constructed at Force Automotive, which is Andrew Hawkeswood's company in Auckland.
"Andrew did all the chassis, the suspension points and cage and then we picked up our cars and have gone our own separate ways.
"Other than the body kit our cars will be totally different. We are running different engines - we had different ideas with the engines - I have gone my way and Shannon has gone his."
Hawkeswood, a leading driver himself in domestic rallying for the past couple of decades, has been at the forefront of the push to the AP4 spec cars that has seen the renaissance of domestic rallying.
At least a dozen AP4 cars are expected to contest the 2017 championship.
With that in mind Davies has somewhat modest ambitions for the season ahead.
"We are too old for winning it but we'd like to think we could be top five. We have had a couple of thirds in the NZRC over the last couple years so we would like to think we would be top five or at least top 10.
"I'm 47. We have just sold our dairy farm so we were just wanting a bit of excitement for the last few years in rallying. That is why we went this way - I love the four wheel drive. I was really keen to get behind what Andrew [Hawkeswood] has done.
"Andrew has put a lot of time and money and effort into a project he believes in and it is paying dividends now. You can see by the number of people who are starting to believe in it and are starting to build them."