1997k1500Calvin
I'm Awesome
That's because you need back pressure, is your motor tbi or vortec, 2.25 is good pipe for tbi 2.5 its biggest you wanna use on vortecI know this a highly debated topic. Back pressure on gas engines. Do you have any links to any sources proving less back pressure is better? My personal experience is that I lost a bit of power and mileage when going from a chambered muffler to true dual straights.
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