[Andreas]

Yes, some are still shown - as they are necessary to give feedback (otherwise people tend to think nothing has happened).

Also, there are cases where there is POST data that has to be carried over, which would not work with a header redirect.

Though, you can sort out those that are only done for feedback purposes:

redirect_generic

PHP Code:

if (!headers_sent() AND !$vbulletin->GPC['postvars'])
{
    exec_header_redirect($vbulletin->url);
}