</font><font color="blue" class="small">( My dad bought some of them for his truck. Funny thing is that only one of them actually will whistle. The other one is just for looks so it doesn't look odd just having one whistle on the car. I can't remember what side the actual whistle goes on. If you blow into the end of each one, one will whistle and one will not. )</font>
Steve,
I believe the 2 whistles are at 2 different frequencies. One of them we can hear, the other is too high of a pitch for our ears.
Ozarker - Sorry to hear about your new Trail Blazer.