I'm in the process of converting the Mustang into a HPDE/TT car and figure I need to add an intercooler to keep temps in check.

First off, anyone have any recommendations as far as brand and size?

Secondly, will I have to re-tune anything because of the intercooler?

 

To make the most of it, I'd get a fresh tune. You'll have colder IATs (obviously), and a good tune will make the most of that.

Vortech sells a nice unit, I'd look into that one.