I think the only real way to measure efficiency would be from inlet temps and flow and or from dyno pulls using a single and then a dual IC set up. But then again unless it was in your car and driving the temps would be different being as the air hitting your ICs would vary on both set ups going thru your grill, or wherever the clean air is coming from. If your ICs are getting good air and they are sufficient to support each turbo's HP and or desired boost, then I dont think you should have any efficiency problems. There is no real way to test this for any application unless you run a single IC in your car and get some real data and then install 2 dedicated ICs for each turbo and check inlet temps and backpressures to see if the single or dual ICs cause a loss in turbo efficiency due to higher back pressures and or a loss of HP.
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