Zoom The differences between the STR4 and the RB5 are becoming apparent

As the media contemplates the opposing fortunes of the two Red Bull teams, Toro Rosso's boss has revealed that the Faenza-based outfit operates with a budget about half that of Grand Prix-winning Red Bull Racing.

Asked by Switzerland's Blick to comment upon Toro Rosso's budget in comparison with the approximately 200m Euros spend of the parent team, Franz Tost answered: "Let's say it's half."

The contrast between the pair, who have moved further apart this year in readiness for next year's ban on customer cars, was never starker than at Silverstone, where Sebastian Vettel won while the similar-looking STR4s battled with the backmarkers.

While Tost is for now holding off fitting a double diffuser because it will cost 500,000 Euros, Adrian Newey's British GP update for the RB5 amounted to about 2 million, another Swiss publication, Motorsport Aktuell, said.

Tost said his Faenza office receives all technical drawings from Newey's Red Bull Technology, but "first we need to know if they work (on the) Red Bull."

An initial double diffuser will be fitted to the STR4 in Hungary, while Red Bull Racing race ahead with the third generation of the rear aerodynamic concept.

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Source: GMM