Quantum is right, the thermacter system is not related to the EGR system at all. How can you own a 93 cobra, and ask if you should remove a EGR plate and plug coolant lines that your car doesnt even have? May I suggest you look under the hood and get familiar with what you want to do before asking a question. This makes it easier for you, and for us to help you.
------------------
1993 GT/AOD
'93 Mustang GT