i have a mate with a GZE, thats running the largest nevo kit available. 175mm. along with 2.5 inch exhaust, large front mount and air intake, it makes 13psi on standard ECU and injectors. the thing hauls!
in the 2 years its been fitted, there has NEVER been a problem with the engine. not one. standard oil changes and servicing, thats it.
i would strongly suggest that you get these mods! makes the car go so much better, and with your ECU there will be even better gains to be had with tuning.
On a side note, i had one made (175mm). it retained the centre of the balancer but the belt pulley was made larger. cost me $160