have a roaring in drive line either ft or rear wheels
Is this the 2.4L automatic or the 2.0L turbo automatic, and FWD or AWD version??
How many miles are on the vehicle??
Does the noise change with the speed?? does turning slightly to the right or left change the noise any??
We need as much info as possible to be able to help…
What have you done so far to diagnose the noise issue?? taken to a shop? put the vehicle up on jack stands to check for loose and or rough wheel/hub bearings? checked tires for cupping/feathering? rotated the tires to see if the noise changes from one axle to the other??
Are you even able to check the vehicle out yourself??
“Roaring” sounds are often associated with wheel bearings in need of renewal. Esp if it gets louder the faster you go.
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With the little info you gave, I will leave you with this.
Buick Regal makes humming noise at high speeds - causes and how to fix it (wheelsjoint.com)
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Check the trunk for lions… 
If this car has more than 50K miles and the rear tires have never been replaced, replace them, they are the roaring you hear.
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