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
How a Maranello favourite went out on a high Gerhard Berger's talent warranted more than just 10 grand prix wins, reckons NIGEL ROEBUCK, but he was a class act up until his final race F1
How Berlin's FE finale unveiled DS Techeetah's new rivals With both Formula E titles wrapped up, there wasn't a great deal to play for in the final two Berlin E-Prixs. But with both DS Techeetahs well down the grid, the two races at the Tempelhof Airport allowed two potential challengers to take the limelight FE
Why F1 may get another Mercedes/Red Bull showdown in Spain Attention is fixed on Red Bull after its stunning Silverstone win. The question now is whether it can repeat that result in Spain, where it seems three factors will be critical. Here's why those show another possible Mercedes upset is on at this stage F1
Is the real Dovizioso back after Austria MotoGP practice? Andrea Dovizioso's MotoGP season has so far been tough to swallow. But returning to Ducati's stronghold of the Red Bull Ring for the Austrian Grand Prix appears - at least after Friday's interrupted practice - to have found Dovizioso back at the front MotoGP
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