I've noticed that my Magnusen 1900 has a whistling sound when I'm driving around at slow speeds just above idle. I've checked all the vacuum connections and everything is tight. Has anyone else experienced this? Any idea what might cause it?

 

Probably hearing the airaid intake. Its not enclosed like the factory airbox and doesn't have a silencer.

 

Ya, could be. I didn't hear it before the Maggie install when I was using the filter but now the intake tube is different.

 

The TVS are very quiet but still have a faint whistle to them. It really is not noticeable with a stock air box but, you can hear it some with a open box.

 

take your throttle body off and PM me a picture of the adapter.

 

Mine whistles/whines a little bit under light load.

 

Mine whistles every time I get on it, sounds like a damn leer jet.

 

^^^You don't have a Magnuson MagnaCharger........

 

Aw come on lol, play along! Its still a 1900

 

There is no adapter between the throttle body and the Maggie case. It fits flush with that big o-ring seal in between. I've used two different ones so that is not the cause.
If other guys hear this whistle then I guess it's inherent to the design. It's not too annoying, just sounds like a bit of a leak somewhere.