Hi assin,
My friend did not have any problem with the e-manage and he got 124hp at wheels. Did you have a problem with your e-manage?
I understand from Ray Hall, Australia who had done a conversion from IS200 to IS300, that we have to keep our stock ecu to control certain features of the car. Ray is using Autronic SM2 on his IS and this autronic ecu has to be used together with the stock ECU.