Just need to double comfirm whether that the T3/T04B will fit to GtiR manifold or not only !!

and any other suggestion to add on the stock GtiR block
Just planned to low boost up to 1 bar ( 14.7psi ) only.

What i have now is
Metal gasket,
444cc Injector
300zx Fuel Pump.

and does it need to upgrade oil pump as well ?
and MAF sensor ? RB25DET is quite big.

ECU not a issue now..
it is later on issue

No that turbo will not fit on the GTIR manifold. The manifold is flanged for a T2 turbo. In order to run the T3/T04B, you would have to cut off the T2 flange anf add a T3 flange onto the manifold.

You can either reflange the stock manifold and do a custom manifold or you can get an aftermarket turbo manifold for around 350-500 bucks that is flanged for the T3 exhaust housing and a custom manifold. But, get a T3/T04E, skip the B series crap.

BRent