There was some discussion about this being the cause of the deep vibration at about 2500-3000 rpm when at Stage 2, if I am thinking of the same part. this happened under full throttle at a higher gear. Pltek discussed making a part to fix this. I think it is different, because the "growling" can still be at higher rpm.
I think the problem we are having is farther back, at the differential. Tonight making a HARD right turn under power, I only got the sound when the rear end stopped sliding and planted. that says to me it is farther back. Remember it is more pronounced, when we have passengers in the back seats.