hi
Just had the transfer box bearings, seals and gaskets change on my 2009 2.4L defender and straight away(first drive) the turbo starts whistling.
Is there a connection between the work done and what is happening?
If the transfer box was removed for the work, the mid section silencer was probably removed and the cat slackened off. Check the exhaust connections have been done up properly, especially the connection to the turbo.