Stock-ish 5.7 Build...2.5" or 3" Exhaust?

Been here and did 2.5 first THEN when we stroked the 5.7-2.5 wasnt enought and had to pay AGAIN for 3in-do it once with 3in and be done and pay for it once.casue you WILL want more .we have 518 to the rear wheels so somewhere around 600 at the crank, if you do the math 3in is perfect .- steve