Toro Rosso's STR11 2016 Formula 1 car made a low-key debut by heading straight out on track in a plain blue livery as Barcelona testing began on Monday.
Red Bull's junior team eschewed any form of pre-season launch or even pitlane unveiling, but was among the first to hit the track when the green light came on to commence 2016 running.
Carlos Sainz Jr is at the wheel for Monday, alternating driving duties with team-mate Max Verstappen through the week.
Toro Rosso will reveal its definitive 2016 colour scheme later in the pre-season build-up.
The team switched back to Ferrari power over the winter amid its parent company's wrangles with Renault.
Although Toro Rosso will be using Maranello's 2015-specification engines, Red Bull team boss Christian Horner predicted last week that will give the squad an immediate 0.8-second per lap boost and leapfrog it ahead of RBR.
But the relatively late engine supply decision means Toro Rosso has faced a "massive" redesign and a fraught winter, according to technical director James Key.