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Infiniti Red Bull Racing boss Christian Horner says his team now has two priorities – to beat Mercedes and to make their cars louder.

Bitter rivals Mercedes beat Red Bull's Daniel Ricciardo into third place at the Monaco Grand Prix as Nico Rosberg led from start to finish to take first place ahead of Britain's Lewis Hamilton in second.

Defending world champion Sebastian Vettel lasted just five laps. He complained of a loss of power before retiring.

In an exclusive interview with AOL Cars, Infiniti Red Bull boss Horner explained that Mercedes got the jump on his team this season because they started development earlier.

"They invested more on the powerplant," he told us. "We can see our car is very strong in the corners, but we lose in the bits between the corners. Renault are catching up and they have to, fast."

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Ricciardo closed down Hamilton in the final stages of the race – and at one point looked close to overtaking the Englishman who was complaining he had something in his eye – but on the tight street circuit of Monte Carlo, the Australian failed to squeeze past.

Horner admitted that as well as trying to close the gap on Mercedes – who are already running away with this year's Constructors' title – his engineers are also working on making the cars sound louder.

Fans have complained that the new V6 Turbo hybrid power units are too quiet and the teams are looking into a solution to make them more meaty.

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"I think the sound is ok, it just needs to be louder," Horner told AOL Cars. "The volume needs to be turned up. We are looking at something to make it louder.

"Formula One has a responsibility to the fans to make sure the cars sound like F1 cars. Mercedes looked at that trumpet, but it didn't work.

"The problem is you're taking all the energy out of the exhaust through the turbo so there's not a lot left to make a noise with. So we need to think of something a little smarter than a megaphone."

Now the Infiniti Red Bull team's thoughts turn to Canada and the race in Montreal in two weeks time.

"We're thinking ahead to Montreal already because it's the opposite of Monaco with long straights," explained Horner.

"F1 continuously develops from race to race. It never stands still. It'll be a big challenge in two weeks."