Question about wolf whistles?

Had one in my High school ride in 1968!

 

My little dog thinks he's a wolf. And when he eats something that doesn't agree with him he often whistles. But it's a positive pressure and not so attractive.

 

http://tampa.craigslist.org/hdo/ptd/3501623144.html

 

I have one on my '55 Chevy pickup (and a bull horn- ok so I'm a ****) I've seen the bull horns with & without the cable...

I mounted the whistle on the firewall and ran a rubber hose to the intake, used an old choke cable to pull the lever.

You can alter the sound with the pull cable and by revving the engine a little - that's how you get the real "wolf whistle" sound.... takes a little practice.