While it's not all that difficult to find out what a really hardcore racing V8 or even V12 can sound like, there are certain engine types which have signature sounds that you almost never hear. But we know that we can always turn to the Audi Quattro S1 Group B rally car for the incredible sounds of an I5 with a great big turbo. Here's a video of the car charging down some back roads which was intended specifically to highlight the sound the car makes.

It certainly looks cool too, there's no denying that either.