We will assume you are using the Turboxs Stage four at this point. The reason for two Aqumaist jets it the power you can make will require a good amount of wate to provide the performance you are after if you lean the fuel mixture to get the full benifit of water injection. One of the forum members si2wrx has a great personal web site if you have not seen it.
The other issue is one Aquamist pump does not supply the volume to run two jets, you will need a large accumulator or two. You could use two pumps. One pump without an accumulator will work but you will still be running rich fuel mixtures to control detonation.
I would place the nozzle in the dicharge end tank of the intercooler if it is a top mount.
For max on power you will most likely use two 0.7mm nozzles when you are at a 12.5 to 13.0 air fuel ratio
To date I have little experence with the Subaru. We are currently tuning a WRX for a customer with the UTEC. It has every thing except the large intercooler. This car does not have water injection yet. We just finished the 91 octane map and have just filled the tank with 100 octane for the next map. When the customer is ready we will add water and tune.
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Brad
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