Loud Buzzing Noise.

Hi,

I have a 2000 Honda Accord EX V6 with 77000+ miles on it. Since October it has been making this LOUD buzzing noise when I drive. The faster I go, the louder it gets.

People who sit in the back say they can hear it louder back there.

I've had people stand outside and listen while I take off but they say they can't hear anything.

So I'm thinking that it's not the exhaust. Espeically since when the car is in park and is running, it purrs like a kitten. But as soon as I take off, the buzzing starts.

And I just noticed recently that when I bear right or make right turns, the noise stops until I start going straight again.

Any ideas? I'm trying to figure out if this is something covered under my Honda Care warranty but I don't want to pay the dealership $90 for a diagnosis.

Any help would be appreciated.

Thanks!