This past weekend I had my stock system removed and put on a dual cat back system. I bought my Flowsound X pipe and 2 Flowmaster Super 44 mufflers (no resonators) while the shop did all the piping (2.25 inches) and installation at Triple A Muffler in Garland, Texas. Be sure to ask for Gary. Used OEM tips that I bought at takeoffautoparts.com and I think my total was under $400. Gary let me buy my own mufflers and x pipe to save money. I can definitely feel a very noticeable difference in the performance of the car--especially in the low end range. Much more jump when I punch the pedal. As for the drone, there is some at certain RPMs but my wife did not say a word. I, however, can hear it and not sure at this point what I will do about it. Let me know what you think!