Question about nitrous and external gate

[06towrig]

I'm building a set of twins with t4 63/68 .91 and s475 1.32, i have a tial 38mm external gate that will go from a steed speed mounted flange to the inlet of the s475's turbine, how much nitrous can that small gate handle, anyone have experiance running a similiar setup or want to offer any opinions? I have never ran nitrous but im just starting to get tempted. do you think the 38mm to small and the fact that it will be dumping back into the 75 will it over speed either it or the 63 with let's say maybe a 100 shot of n20

 

[VMAX]

I ran smaller compounds with no gate and more nitrous. It will be fine.