Running water noise - its common all
MCS cars when they have a smaller pulley fitted there is thread around somewere explaining it but i cant find them, Basically when you hold the throttle on part revs it sounds like a running tap near the passenger glove box, the cause i no it as is that the water pump is running faster as is the alternator due to the smaller pulley and it bascially pushes water around faster and causes this sound!
Scott