The Whir...and what makes a 911 a 911

[scoe911]

..

[Bob Kontak]

I believe it is primarily the fan but the other bits have to add some juicy goodness.

When you get into the slide throttle injection, knarly cam and high compression the basic whir sound is muffled for a different, but some say, acceptable alternative. :-)

[nesslar]

It's a Porsche....a 911...car of the century...........