I know that many of you on this thread are wanting to hear the GMPP exhaust but just in case anyone is interested in the direction that I have decided to go I just ordered some 40 series Flowmasters and will repost a video when I get those installed, but for now this is what it sounds like without the Resonators or the rear catalytics. I kept the Front Catalytics due to the O2 sensors and have not had any problems. I would like to get some High Flow Catalytics, Does anyone have any advice on which company makes the best High Flow Catalytic????