The sound of Formula 1 engines must play an "essential" part in discussions to frame grand prix racing's next set of regulations, says Mercedes motorsport boss Toto Wolff.
Talks have already been started between the FIA and manufacturers about plans for new engine rules after 2020, with F1 committed to running the current turbo hybrid V6s until then.
One of the biggest complaints from fans about the new engines that were introduced in 2014 is that they are not loud enough.
"Why do people say 'rev the engine and go, go go'?" said Wolff. "With everything going hybrid on the road, going efficient, and going autonomous, watching racing cars is still an audio-visual exercise.
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