Not only Ferrari but Merc need to watch out if Honda can bring in proper party mode and get engine programming to synch totally with Mad Max's sudden mashing on the loud pedal.
- That's if the BBCs Andrew Benson is right.
Red Bull have made so much progress with their car in such a short space of time that its cornering abilities at the British Grand Prix overwhelmed the programming of Honda's engine.
In qualifying at Silverstone, Max Verstappen mashed the throttle so hard and fast, thanks to the confidence created by the grip from the car's revised aerodynamics, that the engine electronics could not cope.
The result was a small delay in power application every time he pressed the accelerator - and yet, even so, Verstappen was just 0.183 seconds off Mercedes driver Valtteri Bottas' pole-position time.
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Verstappen never had the chance to show his true race pace at Silverstone because he spent most of the grand prix bottled up behind one Ferrari or another, before Sebastian Vettel rammed into the back of him at Vale and consigned the Dutchman to a fifth-place finish.
But the way he was climbing all over the back of Charles Leclerc in the opening third of the race - with the two Mercedes not far up the road - demonstrated that there was serious speed in the car.
And given that the Honda, for all the notable gains it made in performance over the winter, is still the least powerful engine in Formula 1, and Silverstone one of the tracks where performance is most engine-dependent, it bodes well for Red Bull over the coming races.
(Exerts from longer piece) Courtesy Andrew Benson. Chief F1 writer, BBC.co.uk/sport/formula1, Sun 21st July.