I had my rear cats out and enjoyed the note and drivability. I then removed the resonator, this was a hugh mistake IMO. The car now sound excellent at WOT, but at half throttle or around 70MPH the drone is just noise. I have heard other SRT-6's with just the muffler removed, I am told that there is no drone with this set-up, but to me it just did not sound good under power. My opinion is removing the rear cats will give you a beefer sound with out the drone drama.