water wouldn't be a prob unless it was a sidnificant amount.... remember Team ford have used water injection in their intakes before, as this cools down the fuel air mix and acts as focusing pointws for the flame in the power strokes..... also the presure in the intake system on the intake side ofthe turbo will be higher id are is forced in due to the forward motion of the car, so less effort required from turbo therefore less lag too! then there is the possibity of colder are into ther turbo due to position, this will lead to colder air out as the the heating effect of the turbo is relativly fixed so cooler mix into engine.

The down side would be if the filter fails there is a bigger likelyhood of forign objects getting into the turbo..... and that is not good . that tends to kill engines.