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I assume you're transplanting a 2JZ-GTE into your GS300?
I am going for the TOMS TEC ECU in the future hopefully. No piggyback for me, what will the HKS piggyback do for you?
The HKS unit will actualy work as a stand alone, but I will use the stock ECU for everything but fuel an timming. It should work out. I hope to get it working on the stock ECU and go from there.
Keep in mind that this is the VVT-i motor and I am not sure how V-Pro handles that. I know it's hard to make it work with AEM and tuned Supra ECUs (GFORCE, MAP ECU). Good luck tho, make a write-up with photos!