In determining a sound. Do you ever notice how some cars have a two-tone exhaust note? Sometimes I think it's some kinda fan sound or something like that, but does anyone know?

Here are two cars that have this two-tone:

Lamborghini Aventador LP720-4 50 Aniversario

It's pretty obvious with this car. Kinda like a high pitch wining(Like a supercharger!)

Porsche 911SC

You can obviously here the sound over the engine!

What is making that sound and how??

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