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I don't have direct experience on a dyno, but I've seen several posts on this topic saying that if you dyno immediately after installing catless downpipes you might see a slight power loss due to throttle closures, lower boost, or the ECU otherwise trying to achieve the same target power level with less restrictve exhaust. But if you drive the car a bit and give the ECU some time to adapt this "loss" goes away. But then there is also no real gain, because the ECU has figured out the adjustments to achieve the same target power output, likely at lower boost. Then you tune with whatever tune you want and make power more efficiently than if you still had the stock downpipes. Bolt on parts alone just don't make more power like they did on older turbo platforms without tuning to take advantage, but the fundamental physics still apply, so you can increase you ceiling or just make the same power more efficiently.
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