Have audio from the pit walk when McLaren fired up their Honda, as well as from the Mercedes garage. Might be useful for a direct comparison given I was standing the same distance away from both (and using the same device, that being my iPhone :/).
Interesting to note that it was Hamilton himself feeling his way around the Merc, which is a very rare sight on pit walks, to see drivers. He's keeping his #44, too. But that was probably known already.
Also, the Honda was WAY louder and IMO sounded a shitload better, too.
Is there any interest in me uploading the audio I recorded?
And non-engine related: the Williams livery is actually matte, with only the red/blue stripes being gloss. It's a fucking great look in person, I wonder if there's any practical reason for it?