Three of Formula 1's biggest teams have introduced a range of tweaks over the previous two grand prix weekends.
Between them McLaren, Ferrari and Mercedes have adapted, refined or changed a number of aerodynamic elements on their respective challengers.
Craig Scarborough's videos delve into the detail, explained by Stuart Codling.
The perfect Formula 1 car from 2016 Mercedes swept all before it again in 2016, but it was not the perfect car - take some bits from rival teams and you'd have quite the potent racer... F1
F1's new development war has already begun The last grand prix weekend before the winter offered teams a great opportunity to get a headstart on work for 2017 F1
F1 teams still pushing with an eye on 2017 The F1 development race hasn't slowed down as much as expected in the final races of the current rules cycle, with teams still pushing to maximise running before the winter break and Mexico-specific solutions on show this weekend too F1
A glimpse at McLaren's 2017 work at Austin? McLaren struggled at Suzuka, but on Friday at Austin it introduced developments to its MP4-31 that could well have next season in mind F1
Will signing Vettel save Aston Martin? Racing Point's decision to hire Sebastian Vettel for the start of its new era as Aston Martin is intriguing. Lawrence Stroll's team opted to cut the emotional ties to Sergio Perez to sign a multiple champion, as the next step of a wider long-term strategy F1
How a DTM failure became an unlikely Nurburgring conqueror Opel's fortunes in the DTM had taken a turn for the worst by 2003 - hardly the pedigree that suggested it could take on the toughest 24-hour race of them all. But that's exactly what it did DTM
How the first F1 Mercedes laid the path of greatness When one of the giants of pre-war grand prix racing returned to the track in the 1950s, it did so with game-changing thoroughness. STUART CODLING examines the Mercedes W196 F1
The youngster set to end a 20-year wait for Suzuki Three podiums from the last four races have propelled Joan Mir into the fight for the most unlikely of MotoGP titles. However, there are other factors that further back up his chances of serving up Suzuki's first premier-class crown since 2000 MotoGP
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