OK, I was driving down the road around 70. Accelerated to pass a car and suddenly under boost, it souded like a train horn went off under the hood. I only hear the noise when boost hit 5lbs or greater. Seems to be loosing coolant from the from of the motor some where. The noise sounds identical to a train horn and seems to come from the front of the motor. Checked for leaks and couldnt find it. Thinking maybe the intake or something similar. Any Ideas?????