IHI APEXI RX5/RX6D Turbo on 4G63..

As stated I just purchased a rebuilt IHI RX5 turbo high flowed, with RX6D internals with a custom manifold..
Has anyone ran this set up on there 4G? I've heard this turbo set up on skyline which was making 480hp..
RX6D on turbine housing
Spec: TW1 P12 - 525A
Serial: RX5 5061912

 

What sort of boost should this be able to handle.. It was such a cheap buy I couldn't say no..