[Logician]

yep you can apply the hack and in the header use the conditional:
[[($bbuserinfo[userid]>0)]]
your header for members go here
[[/($bbuserinfo[userid]>0)]]

or

if you want "the hack" way,
edit global.php find:

PHP Code:

eval("\$header .= \"".gettemplate('header')."\";"); 


After that add:

PHP Code:

if ($bbuserinfo[userid]==0) {$header=' ';} 


Both will do the trick, choose your pick