4" downpipe on stock turbo? 5" for the rest?
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is five inch necessary? not unless your over 500 horse. is five inch better than four inch though? i think so, its bigger, deeper tone, sets off every car alarm, messes your ears up on long drives (air pressure around the truck goes haywire) with the windowa down, and if you do go to make big power one day you do not have to buy another exhuast. i love my five inch exhaust. four inch i feel is overall louder then five. but five is just so much deeper sounding.
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