Remove the muffler
no--bearings and tires are the most likely cause of roaring--esp if it gets louder as you roll faster
the wheel bearing on the vehicle will make a roaring noise when you accelerate the faster you go the louder it gets
Most likely it is a belt on your car. Usually the squeeling is from a loose belt while idling and will also make noises while driving.
bearings old tires shock observers steering wheel
it may be the drive shaft u-joints if its rear wheel drive
No, in full electric mode which some can do up to 60+ mph, they are almost silent.
Sounds like a drive train problem or perhaps a wheel barring issue, depending on your vehicle.
The difference in combustion: you shouldn't change while under power:
If the roaring sound Changes with speed it could be a bad wheel bearing. If the noises changes with braking check the pads.
Siberian tigers do make some sounds. Two such sounds are growling and roaring. Like all big cats, tigers can't purr.
Apart from some wind noise when driving, none