MT2 + .18TZ requirements
 

I am just about to purchase a whole bunch of hop-ups for my MT2 (around $300 worth). I'm looking to chuck a O.S .18TZ into it. I have heard that some things are required like new diffs and such. Can anyone help that has done this? Just a quick part list or parts I should be grabbing. Also what O.S .18TZ will fit the MT2? I don't need the pullstart as I will put a rotostart on there.

Thanks.