I have noticed lately that my car is making an exhaust leak type noise from the drivers side front when accelerating between 2700 and 3200 rpms. It can be reproduced all of the time in this rpm range no matter what gear, cannot hear it unless the car is under a load? Can't hear it unless the windows are up. Has anyone else noticed this? Is it normal, or do I have a problem? I realyl don't want to take this thing to the dealership