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I would believe that on a hot engine, water vapor increases performance, especially on a turbo car.
Since the added mass, creates added expansion, your turbo should rev higher.
Routing the AC drain pipe to a sponge in the air intake (or wetting the filter), is a great idea to both increase filter effectiveness, as well as cooling down the intercooler, and at the exhaust point, revving up the turbo.
If you have an eco turbo engine, you can expect a little more torque at lower revs.
If you are running a performance engine, and can choose between 2 types of turbo, it might benefit to take the larger size turbo (lag, but also much higher HP), if your engine can handle the increase in power.
The water vapor of the AC unit is too little to make a big difference, but might actually benefit eco turbo engines, in hot summer days.
Cons of water injection is:
Much faster exhaust rusting.
Water coming out of the tailpipe.
White smoke coming out of the tailpipe (might not pass regulations on some places)
Not much is known about how the water interacts with engine oil, and engine bearings and rods.
AC drain pipe does not supply a steady stream of water (which is why you'll need a spongy kind of material, to soak up any water splashes, and transfer the water into the air intake, as much as a vapor as possible).
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