[jyeah]

I'm not tuned. The thing about waiting and hoping the exhaust drone goes away after time is that I actually drive friends from time to time and they can also hear the drone. ~_~" Only have PPK Stage 2 installed.

I guess my main concern is:
1) Whether or not the problem is normal, because if it is, I guess I've made up my mind to go back to the stock exhaust.
2) If the problem is not normal, what is the best course of action to get it resolved.

A) Have the PE properly resealed and have the clamps re-tightened
B) If it's a faulty PE exhaust that has problems, have it replaced by BMW.
C) If it's un-fixable, have the stock exhaust reinstalled and sell the PE part.