I bought my ECU a few days ago for my EVO 7. I talked with an Evo 6 owner and he told me that this ECU was developed just for low/mid range power (rally purpose) and when he installed it on his EVO 6 he lost maximum speed.
On the other hand I saw some posts about this ECU improving all rpm band including maximum power by 20cv. I sent an e-mail for my friend in Japan to contact Ralliart directly and ask what kind of performance this ECU gives. The answer was not satisfactory, Ralliart just told he that this ECU is for competition people and improve untill the middle rpm rannge. What happens after middle range is occult.

Unfortunately I don't have access to a 4wheel drive dyno and the butt dyno is not the best way to evaluate the power.

Someone here have experience with Ralliart ECU?

Will I improve or maintain or turn worse my high rpm range? (max speed)

Any Help I would appreciate