most of the noise i have been getting hasn't started until i get up around 50 mph. it starts as a low pitched rubbing/grinding noise then builds in intensity. when i let off the pedal, it will stop but as i accelerate again and maybe gain another 5 - 10 mph, it will start again. it has gotten to where the floorboard will vibrate, which is how i first noticed it, with the sterreo up i did not hear it but turned it down after i felt the vibe. to me it sounded like it was coming from the front, but the tech at my shop said it is coming from the drive shaft because of the new angles.