HFS-3 Injector size Calc

[naviuk]

Hi All

I recently got my HFS-3, i'll be installing it into my 2006 Subaru STi. I'm busy planning the install.

Apart form the ongoing debate of whether to go pre or post intercooler (TMIC) i'm thinking of testing both, well all three options.

Pre-Only
Post-Only
then pre and post combined.

I am using stock injectors that are decapped, the flow rated tested on each was approx 1040cc.

Questions:
1. What is the best way to calculate a starting water/meth injector size.
2. If you use two, would it be logical to use two smaller injectors, or a combination adding up to the initial one injector size?

Thanks for the help!!