On advantage of injecting pre-compressor is that, should the WI fail, it would take several seconds for all the water to evaporate off the walls of all the tubing before the engine. This was noted by the folks at Linkoping University when doing experiments with WI and an Ionization Gap Sensor feedback ignition system.
If you have a very very good ECU on the engine a WI failure would be not much worse than running into a bad tank of fuel and the ECU should eliminate the knocking within one or two engine rotations. Most engines are designed to be able to handle rapid changes in octane even if they like higher better.
EGT might be another problem, but if you feel the car suddenly getting slower it doesn't take a rocket scientist to know something might be amiss and worth investigating.
Adrian~
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