Welcome to VZI.
The characreristic Beetle "Whistle" sound, is produced by the exhaust Tail pipes. only the standard type tailpipes make that sound, and only when they are correctly fitted. Sometimes new tailpipes don't make the sound until they have been used for a few weeks. The rest of the exhaust system needs to be in good condition too. I've never heard of a "Whistling nut" but it' seems like an interesting name for a misunderstanding of the way the fuel and exhaust systems work together.

 

its a leak free standard exhaust,

some one is tugging your leg about a nut mate

 

Good to find another VZi member from SL.

Knowing the way local VW mechanics work I think I can answer this one.

One method used to create the extra whistle is to bend up the metal air deflector for the generator. This may result in a fried generator a few months later so dont do it.

Another way is to get a set of Brasillian tailpies that has the the internal muffler extend outward a few mm. This gives a crazy whistle.

Check out Golf Motor House for the pipes I got them there. The chrome work on the pipes is also good and doesn't rust in 6 months.

regards

SD

ps. dont believe what the local mechanics tell you. Its mostly BS. Ask me how I know.

 

I have concluded that the whistle comes from the pre-heat pipes connection to the manifold. The fast flowing exhaust gases act in the same way as when you blow over a hole i.e. like a flute, bottle etc. I came to this conclusion because my 4>1 turbo trip still maintains the whistle and the only difference between mine and everyone elses is that I have two small pipes connecting from the twin hot spot, down into the collector. No doubt also that the pea shooter exhausts enhance the sound on a standard exhaust.