The Formula One season starts in Bahrain in just over a week with Red Bull the only top team to have named a unchanged driver lineup after last year's best ever season.
Red Bull finished with three wins in a row and was second in the constructors' championship.
Sebastian Vettel was second in the driver's standings behind Brawn's Jenson Button, with Mark Webber fourth.
But the drivers will have to get used to some technical changes, one of which is a heavier car which Webber says will be physically easier on the drivers because the cornering speeds are lower.
Vettel says the team's expectations are high ahead of the opening race.