May 20 (GMM) Red Bull had to modify an element of its rear diffuser during the recent Monaco grand prix weekend.

Germany's Auto Motor und Sport reports that McLaren identified an element of the dominant RB6's design that did not conform with the regulations.

The rear of the Adrian Newey-penned car has recently been under intense scrutiny by Red Bull's competitors, resulting in numerous team mechanics crowding around the gearbox while it sits on the grid.

"Obviously the back of the cars are so sensitive now we try and make it as difficult for others to see as possible," confirmed team boss Christian Horner.

Reportedly, McLaren's engineering director Paddy Lowe spotted something on the Barcelona grid that he suspected did not conform to the rules with regards to the "infinite precision" principle.

Red Bull was asked by FIA officials in Monaco to modify the design, but subsequently dominated the famous street event.

"We had to run a version without those (diffuser) wings and found that it was even better than before," said Horner.

Latest F1 News - Mobile version

26 Feb: New Ferrari not quickest in field - Domenicali 26 Feb: Red Bull still best in 2013 - Tost 26 Feb: 2014 French grand prix 'possible' - Prost 26 Feb: Danica Patrick 'not interested' in F1 switch 26 Feb: Report - Gilles Simon working on F1 engine for Honda 26 Feb: Gutierrez plays down link to Carlos Slim 26 Feb: Caterham exhaust 'legal' insists van der Garde 26 Feb: McLaren replaces Mercedes-bound Lowe 25 Feb: 'Engine maps' trouble for Red Bull, Lotus - report 25 Feb: Mercedes-bound Lowe to miss 2013 opener - report 25 Feb: Mercedes 'in group of teams' behind Red Bull - Lauda 25 Feb: Gutierrez expects Hulkenberg to beat him early in 2013 25 Feb: New Ferrari 'much better' than 2012 - Massa 25 Feb: Teams 'will adapt' to new tyre situation - Gutierrez 25 Feb: Tight rules make today's F1 cars 'the same' - Forghieri 25 Feb: Williams removes controversial exhaust trick 25 Feb: Contract 'conflicts' cause of Marussia test snub - Razia 25 Feb: Lotus to fight Red Bull for title - Gutierrez 25 Feb: Marussia 'ahead of Caterham' - Chilton 25 Feb: Sutil will not stay in F1 as test driver The latest F1 News - Mobile Version