The 19-year-old Queenslander will drive Porsche Cars Australia's #60 guest car at the final round of the championship, with backing from Fujitsu General Australia Limited.
Foster tested the Porsche at Winton on Friday and says that he wants to make the most of his Carrera Cup debut.
“This is a massive opportunity for me,” said Foster.
“I finished my Formula Ford career off at Tassie with a win, so we're coming off a bit of a high.
“To get this opportunity is great and I have to thank Fujitsu for continuing to back me and the Porsche City Index Carrera Cup for helping me put this deal together.
“It's a bit of a reward for the hard work we've put into making this happen. This has been on the go since about July so it's been very hard work and a long time in the making but it's finally all come together and I've got a lot of people to thank for that.”
Foster has been a part of the inaugural Fujitsu ‘Cool' Driver Program in 2011. He will also carry backing from long-time supporter Steeline at the Sydney Olympic Park street circuit.
Foster won the final round in this year's Australian Formula Ford Championship at Symmons Plains Raceway in Launceston, Tasmania two weeks ago, finishing third in the overall points standings.
Sonic Motor Racing has prepared the car for Foster's campaign in Sydney, the guest car previously driven this season by Mark Skaife at Albert Park and Mark Noske at Townsville.