That is about your best resource for Subaru information. I am not familiar with the Hydra system as I got hooked up with Cobb Performance and use their programmer to retune the stock ECU and it's all I have ever needed. Under the Engine Management section of that website is a Hydra EMS section.
Great guys over there and great tech information.
Have fun with your Subaru, have had mine for 100,000+ miles now and love it.
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