"Traditionally we only go there in October for the two-driver enduro but these days the 1000 is a flat-out battle anyway, heading there for a sole-driver sprint race weekend is really exciting and there's a buzz in the air with Bathurst as the season opener.
"It's a great feeling heading into a new year with the same engineer and crew, but we've complemented that with the recruitment of Richard Hollway in the engineering department.
"He's worked with Manuel for seven years previously so they already have that rapport and working relationship, and it feels like he's been here for years already.
"We're in a great position, we've got great staff, great equipment and we're as hungry as ever. It's time for Team 18 to get up the front and chase those wins."
Team owner Charlie Schwerkolt expects Winterbottom to make key strides in 2021, with the team aiming for race victories having secured its 2020 goal of multiple podiums.
"2020 was a year where Team 18 stood up with multiple podiums in our first-year as a two-car squad, so for 2021 we want to take the next step forward and be a consistent force in the Supercars championship," Schwerkolt said.
"With the drivers, the crew and the technical nous behind us, we really have what it takes to become a top four team in this championship.
"Frosty joined our team looking for an environment to build and prosper, and from the outset he has shared my vision of the team and where we're headed.
"He's as fit, fast and determined as I've ever seen him and I believe in 2021 we'll see the fruits of his hard work."
Winterbottom will debut his new #18 IRWIN Racing livery at Winton Motor Raceway on Friday 19 February for official pre-season testing.
The 2021 Repco Supercars Championship will commence at the Repco Mt Panorama 500 across February 26-28. Tickets are on sale now.