2 1/2" or 3"

Go for the 3" w/ Dynomax Ultra Flows. 3" will not clear relocated leaf springs with a stock fuel tank. A fuel cell is required if exhaust is run to the bumper. 496 stroker usually means in excess of 500 hp.That's supposed to be the dividing line from 2.5" to 3". Hell, I'm putting 3" on my 408 stroker & I don't have 500hp. At least not yet!