i have a 1993 mitsubishi 3000gt vr4. it comes stock with 2 td04 t3's i am wondering how big can i go without having to upgrade anything with the motor. i might upgrade the cams if needed and if i do that does anyone know what the best cams would be for the largest turbos

 

Do you have any supporting mods done to your car yet? More information on your current setup will make it easier to answer your question
~Brian

 

Its stock

 

Alright, well I would start by doing some reading to get a basic idea of how to safely go about modifying cars, and get a little more familiar with your car in particular.
Here is a great place to start reading :Dave Black's 3000GT/Stealth Resource and here is a direct link to a modification sequence.
Dave Black's 3000GT/Stealth Resource - Stealth/3000GT FAQ

Like it says in the link the most important part of a build is starting out with a well maintained car. My suggestion is to get familiar with your car by doing a through tune up. This will not only give you a solid platform to start from (your car), but it will also give you a better sense of where everything is under the hood. Do some reading and let me know if you run into any hang-ups or have any particular questions
~Brian