Do not have a clue mate haven't opened it up brought it just out of interest to test it out ran really well when I brought it from toyosports they told me it was a billet
You can still run a 4e ecu as above but an after market jap plug and play ecu that can raise the rpms would work better or getting a piggy back and maped up
It can be the turbo seals check all the boost pipes for any oil check the compressor housing for any oil while the pipes are off as well also does it puff out smoke randomly on idle?
Toyosports TD05 20G Turbo solid turbo still in new condition only covered 100miles ran it at 1.1 bar with no issues at all no shaft play no smoke face rotated and actuator not included £100 Collected from East London (postage extra £15)