If it occurs loudest under acceleration it's likely a drivetrain problem and not what I've run into in the catagory of weird noises.

My 'come from all around' noise was from vibrating exterior chrome trim on the windshield. If there's any chance it may be that, one way to check it is to duct tape whole sections of the trim. I'd start with the entire vertical trim on the passenger side.

/// I was afraid of that. That means you can't use a tube as a stethoscope to trace to location of the howling. Try setting the brake, put the car in gear and watch the engine as someone else lightly applies the throttle. Does the engine rise and attempt to twist. That would be motor mounts positioning the engine for the noise, then look at what is moved or stretched, (that pleated air tube). If it only does it on acceleration that would eliminate any plugs or tubes that are mounted on the engine.

You can jack the rear end and run the car to see if you can locate the noise. If it is not apparent I suggest the stethoscope. I have a water supply tube of polybutyl (grey, stiff, straight and about three feet long) with an arm to ear length of flexible vinyl to fit over the end of the polybutyl.) You will not have to get under the car to locate the noise with this rig. If you eill the end with a bolt you can touch that metal bolt to car panels, axle, transmission, center bearing clamp, etc.

WARNING WARNING WARNING If you jack one tire only do not apply the brake to stop the wheel when you are finnished. The car will jump off the jack. Turn off the engine and allow the system to coast to a stop.