Strange sound at end of rev range when push throttle when parked

Asked by May 17, 2018 at 11:04 AM about the 2006 Jeep Commander Limited 4X4

Question type: Maintenance & Repair

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. Nothing appears
loose underneath.

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 or spark plugs were 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 causing some sort
of back draft sound/ issue?. Thanks for any help!

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