forget using the standard sx box, it wont handle the extra torque of the supercharged gze let alont a turbo'd gze.
I had a mate go through 2 sx boxes before changing to the gze box and now he is happy...
Also, buy a front cut, it will come with EVERYTHING necessary to do the conversion. My other mate bought just a motor and spent weeks trying to find things that were missing from the motor package. A front cut almost guarantees nothing has been touched since the Factory...
I have had a GZE for over a year and have had no problems with it as i got a front cut. I am now going turbo....