2" to 3" exhaust... Worth it?

Run 3" off the header collectors up to the mufflers then run 2.5" mufflers and tailpipes. Your engine won't make use of 3" exhaust but keeping it the same diameter as the header collectors will boost torque in the low-mid-range by extending the secondary header tuned length. I already have 2.5" exhaust on my Duster with a ~450 HP 360 but plan to put in the bigger pipes from headers to mufflers when I install my Doug's D453 longtubes.