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I just installed a Gibson Dual Sport Stainless Cat back system on my 4.6 flareside. It has a nice mellow sound at idle but comes on pretty strong if you hammer it. Seat of the pants feel seems to have a noticable increase in power. I have Mickey Thompson 33 17's and I am trying to get back some of the gas mileage sacrificed to the bigger tires. I have an AFE Cold Air Induction coming later this week to add under the hood. Plan a trip in the next week or so to Colorado to do some skiing. Hopefully I will notice an increase in fuel economy.
Installation of the Exhaust was super easy. I did the dual exit behind the passenger rear wheel. The only adjustment I had to make was loosening the spare tire and sliding it over to the driver side an inch or two and tightening it up to keep it away from the dual exhaust. Looks and sounds great. Not too much noise in the cab except at certain rpm ranges which are not cruising speeds.