IMO it's one of the sexiest sounds I have ever heard. It's just beautiful.

And yes, I can hear it clearly with the windows and sunroof closed but obviously, if the windows and/or sunroof are open, it certainly helps.

Also, tunnels help big time even with the sunroof and windows closed.

For any enthusiast, this option is a no-brainer (provided your budget can stretch to it).

I've done the PSE vacuum hose disconnection mod so it's ON all the time with no cut-off between 30-50mph.