Sutton Images Enlarge Nico Rosberg says Formula One needs to go back to the drawing board if it wants to make the cars louder this year, after a trial exhaust system failed to produce the desired effect at Wednesday's in-season test. Mercedes ran a 'megaphone' exhaust on the car in the morning, but removed it after 13 laps and replaced it with its standard specification. From trackside the exhaust made little difference to the volume and Rosberg admitted it had not changed anything. "Unfortunately it didn't change anything so we need to keep pushing," he said. "We want to, as a team, make things louder for the sport. We need to keep pushing and try some other solutions...
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