I have a weird noise. I sounds like a groan or a vibration at exactly 2k RPMs. It does it worse the more load the engine has on it. If I put it in neutral or park I can barely hear the noise, but if Im in first taking off it does it and it continues to do it in every gear. If I brake stand the car it will make the noise much louder. I cant trace the nose anywhere under the hood. It sounds like its coming out the rear. Almost like I have a baffle loose in my muffler or an exhaust leak. But I figured Id hear it at different RPMs. Anyone have any ideas?

Bump.

Also I started noticing this after my car sat for a few days. I cant seem to hear the noise outside of the car. Just inside.