Toro Rosso's mid-season development stunted the team for a little while when the STR11 didn't respond as expected to the B-specification update.
As such, its programme has been a little opaque of late, as it first identified why the update didn't match its expectations and subsequently spent time revising its targets for the given GP.
The crux of its issues lay in the new aerodynamic package, as although it met the downforce targets it also produces more drag than was originally intended.
The team introduced a new rear wing in Malaysia, which features a butterfly shaped mainplane that sweeps upward toward the wings centreline.
The wing has been installed for Thursday's scrutineering and means the team will at least test it on Friday but likely run it for the entire weekend given the trade-off it grants, providing sufficient downforce for the corners and a reduction in drag on the straights.