F1's supposed 'sound problem' is going back to the drawing board, following the track debut of the Mercedes 'megaphone'. At the post-Spanish grand prix test in Barcelona on Wednesday, the exhaust of Nico Rosberg's dominant W05 car was fitted with the trumpet-shaped attachment designed to turn up the volume of this year's new turbo V6 engines. "It wasn't a great solution," Rosberg said afterwards in a video posted on Instagram. The 'trumpet', which can be heard at https://www.youtube.com/watch?v=OAuupY65NcQ, was later removed from the silver car. "It just didn't work," Rosberg explained. "It didn't make it much louder. So we'll just have to look for another...
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