Nope, its a TOM'S ECU but its still Toyota as far as i know you can't tune them, then again i would be glad for someone to prove me wrong :D plus these cars don't have boost control via the ECU, its just what the actuator runs.
i think my exhaust is restrictive as to why it drops off boost, as i now run a larger turbo that flows more exhaust gas and therefore it can't get rid of it as efficiently. I also believe a boost controller is in need for my car.
Karl.