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From what I've heard, it's almost impossible to beat the stock 6.2 exhaust for flow without getting seriously crazy, but lots of guys do it to get a sound they like better. I'm happy with stock, myself.
Yeah my exhaust is factory except the muffler is replaced with a 3.5 pipe. It has some drone but not too bad. But after 200k miles of driving,y next truck will remain quiet! Ha