I have been using a Gibson SS single side swept cat back exhaust for about 90,000 miles. It works as good as it did new and show no signs of going bad. Gibson is quieter than many exhaust systems but you can still hear the exhaust note. Just right, IMO.
With my 4.0 SOHC, I saw a little improvement in mid-range torque and a little more improvement in high revving power. No change in gas mileage.
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