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Check your transmission fluid level, as recommended in the Owner's Manual. Also, if your car is equipped with power steering, check the fluid level in the power steering reserve.
If all fluids are at recommended levels, see if you can locate the noise. If it is in the engine compartment, try to determine if the noise is coming from any of the serpentine belt pulleys.
Sometimes the bearings on air injector pumps fail in higher-mileage vehicles, first causing a "whining" noise, and ultimately resulting in the serpentine belt "chirping" or squealing on acceleration. Best you can do is make sure all fluids are at recommended levels, then try to pinpoint the source of the whining noise for further diagnosis.
Have you crawled under the vehicle and personally inspected your exhaust line from manifold to tail pipe? The roaring sound usually occur when there is a hole in the exhaust line. I had it happen to my forester before. A hole half the size of a dime made my subaru sound like my old 74 chevy pickup.
Have you tried to narrow the noise location. is it comming from the transmision safety plate? is it comming from the belts, or a pully? Have someone litely step on the gas and try to reproduce the noise while not in gear. If possible locate the noise, or narow it down to some sort of location. There are just to many variables to say what it is at this point.
might be one of your catalytic converters clogging up. usually happens after engine has been running for a time? mostly heard when you let off the gas pedal? does the noise appear to be coming from the transfer case area? i thought i was having tranny problems, but turned out to be one of the catalytic converters. whew....