This is not really answering your question, however I went with the Magnaflow cat back just a couple of weeks ago. I wanted to be able to put the stock back on should I ever decide to. Drone does not seem to be an issue. I went that direction due to cost. It was only $729 delivered to my door. Here's a small teaser video I had my girlfriend shoot today. Just a couple part throttle hits and a small burnout.
http://s244.photobucket.com/albums/g...tsidedrive.flv