Anyone know of any plugins for after effects so that i can render out mpeg4 files?

Have you considered quicktime mpeg4? With ae you should be able to encode mpeg4 with the standard quicktime plugins.

To the best of my knowledge AE should be able to render out
to any codec you have installed whether it's QuickTime
or AVI. The advantage is that QuickTime installs its own MPEG4
codec which you can choose. For AVI you can install a 3rd party
codec like DiVX or XviD which are both MPEG4 codecs. These two
also have the widest installed MPEG4 codec base on PC's.