It seems it was McLaren's engineering director Paddy Lowe that first spotted an element on the RB6 rear diffuser while the car was placed on the grid in Barcelona, which made the unit interfere with the current technical rulebook of the FIA. He therefore let the ruling body know about the aforementioned element and Red Bull had to come to Monte Carlo with a revised rear diffuser.
Ever since Red Bull started to dominate the qualifying sessions this season – while also winning some 50 percent of the races so far – all their rivals are keeping a close eye on the RB6 on the grid, trying to figure out what's so special about this car that makes it so much quicker than anybody else's.
The rear diffuser area is something of particular interest for most of the teams, as it has led to some intense scrutiny in recent grands prix from Adrian Newey's fellow designers. Red Bull's very boss Christian Horner admitted that his team is making quite an effort to hide the rear side of the car while on the grid, in order to keep their designs safe.
“Obviously the back of the cars are so sensitive now we try and make it as difficult for others to see as possible,” said Horner, who admitted that he had to change the design of RB6's rear diffuser prior to the Monaco race.
“We had to run a version without those (diffuser) wings and found that it was even better than before,” added Horner.