Guenther Steiner expects Haas' aerodynamic development will be "better and more consistent" in 2018 as the team continues to increase its Formula One operation.
Haas has a close technical partnership with Ferrari, which includes an engine deal, and also works closely with Italian chassis designers Dallara. The team has been building its own aerodynamic department since joining the grid in 2015.
When asked if that had been the biggest area of growth for the team, team principal Steiner said: "Yes, absolutely.
"We started to get people in last year and there is more coming now. There are more as well as last year when we started we did not enough people as we just started.