Hx35 s475 compound injector size

I'm in the process of putting together my 12v, my plan is to run my stock hx35 over an s475, with the intentions of upgrading to a larger primary down the road, my question is what injector size should I run so I don't outgrow the injectors with a larger primary charger, I was thinking of running a 5x16 from what I've read





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