McLaren doing some Le Mans testing?

[FourWheelDrift]

A 720s GT3 running at Monza without using the first chicane - https://youtu.be/W3kaxNJSdWg?t=258

Comments say it sounds different as well, could be a hypercar mule?

I know they are interested in the new hypercar rules for Le Mans.

[Krikkit]

Definitely sounds like an MGU-H has been added to the standard V8 - sounds totally different to when it was at the Goodwood FoS: https://www.youtube.com/watch?v=73ODtT3XpII