got 1 from nz for cheap too. A friend had 1 in his evo and it ran really well. Found out it-take out the speed limiter, afr11.8-12, rev to 8000, run more aggressive air and fuel, 1.4 bar. More torque and response. Apparently you just take out your old evo ecu and plug the mines in.
Haven't picked it up yet.
A chippable aspec gsr ecu will do the same thing on cheaper and wont be locked and also wont be tuned to suite Japanese fuel but will be tuned to our fuel with what mods your running.