Guys,
Emanage ULT is a piggyback, so I guess it will depend on engine type.
I had Emanage ULT in my S2000 before I switched to Hondata, you do have the option to raise the limit for rev limiter in the software, the question at hand is if the Mitsu ECU is first of all connected on that pin and secondly if it can be overridden by a piggyback.
You better check on a US forum for that answer, more guys use Greddy Emanage there. You can download the manual BTW, so you see yourself what options you have (there's a lot possible there, Emanage ULT is the best piggyback by far).
Andreas