Exhaust for 03 silverado

I just purchased a 03 silverado 1500 4.8L ext. and I want to put a cat back system on it. I had a grand cherokee with a flowmaster on it and I loved it but they tell me the flowmasters on a silverado is bad. They say it resonates in the cabin. Is this true also what do you all like as far as looks, duals out the back,1 on each side or 2 out 1 side? Suggestions on a system please.

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