Who has removed the resonator on their '09 Factory JCW? Is there a noticeable change in performance, and if so, what changes did you notice? How drastic did the removal of the resonator effect exhaust sound? Has the removal caused codes to be thrown? I'm considering removal of mine if the performance improves but having experienced the constant drone of a MaganaFlow exhaust on my previous R53, I want to keep any increase to the noise level minimal.