Let me clarify my statement by saying it is quieter in the cab at idle than the stocker. Standing out back it's definately got the rumble of a flowmaster, but doesn't sound like a dragster waiting to take off. It's loudest when under a load (up hill) at low speeds (<40mph) in the 1,800 to 2,200 rpm range, still not too loud for my tastes though. I haven't heard the Banks in person, but judging from the sound clips posted, I'd definately say I like the Flowmaster's sound better. Signature Flowmaster sound in my mind is automatically associated with big V-8s. Performance wise, the butt dyno says little improvement perhaps. It still leaps from the line like it did with the stocker, but this time the truck in the next lane is not only suprised but also scared!
I'll be honest and say that for me the dual pipes were done mainly for sound/looks with performance and MPG improvements being a side benefit. If you like the Flowmaster sound and dual pipes then do it. If you are trying to squeeze 1 mpg or a couple more ponies out of the 5.6 but still have a civilized truck, then keep your stock exahaust and be happy. There's my warning.
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