I was just wondering what your thoughts are on this sound I’m experiencing with my Jeep? I have a Jeep Commander 5.7 Hemi 2006 with a Magnaflow 49709 cat (newly installed) and a magnaflow 18″ oval muffler (installed a year or so ago) with stock resonator and pipes between the mufflers and cat. I have new sparks and coil packs and have very recently cleaned the throttle body. I have a sound issue from the exhaust, it sounds like a flutter/ chug at the end of the rev range (need to listen carefully). It does not give a smooth rev the whole way through it. Really annoyingly, I cannot remember if I was experiencing this sound before the cat was added or not. Have you got any idea as to what might be causing it? Could it be the stock rear resonator as it appears big and bulky, reducing flow and sound. Thanks for any help!