3
I think I'd try to modify the /system/templates/system_redirect.html file. You'll need to clone the system templates first and then edit the cloned template.
Rather than "hacking the core" I'd just edit line 5 and change it from:
<meta http-equiv="Refresh" content="[d][b][color=CC0000]<{$time}>[/color][/b][/d]; url=<{$url}>" />
to:
<meta http-equiv="Refresh" content="[b][color=0000FF]0[/color][/b] url=<{$url}>" />
and then update your system module to clear the template. The "danger" of this (as McNaz states in the other post davidl2 pointed to above) is that some browsers don't support redirect and so your site will appear to "hang".