hey guys tody is my first say here..so im new :) but anyways can someone help me find a EMS or tell me what the best EMS is for my 420a?

There are several different forms of ems for our cars. It really depends on what features you want.

You have:
Megasquirt-Cost efficient, but very D-I-Y, Lotsof research to be done with this.

Hahn's Portfueler-An 8 injector setup, kind of pricey, boly fairly bolt on.

Aem F/ic- New system from Aem, midrange in price, but is so new, support may be hard to find.

there is always the Sfmu setup which is a rising rate regulatoor that controls idle pressure.

this is just a brief outline on what's out there for our cars. My best suggestion to you is to search for megasquirt and portfueler topics and see which one of those best fits what you are lookin for.