I don't think the Gen2 was documented well enough because the Gen3 was taking over soon enough for too similar of a price. There were also fitting issues with the Gen2 early on, since Stillen seemingly just carried over from the previous HR engine.
I'm not sure how the tube diameters compare either other than I've been hearing the G3/Z1 are supposed to be larger — but I really don't know about that.
Between the AEM and Gen2, the most noticeable difference is the bends. The Gen2 turns mainly at the throttle body while the AEM has an additional bend on the filter end — hence why the heat shields are smaller and it seems to fit in the engine bay more nicely.
Best arguments I'd see for the Gen3 are if the tube diameters are truly larger than the others mentioned, and it really just hit that sweet spot without bottle-necking or anything. On a limb, airflow might be smoother within the intake system since there's more pipe length to transition into laminar flow.
I could be full of s*** on that second part, but we know the possible gains and in the end. The 6-8whp or whatever isn't a game changer to stop a V8. Pick what you like. I have a G3 now because I decided I'll scrap for the last of the gains.
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