2 inch pipe vs 2 1/4 inch pipe

Thats what i thought \, i always run 2 1/4 inch exhaust pipe but i bought this truck without an engine, but the exhuast on the truck was brand new its dualed exhaust with heeder collectors its 2 inch exhaust and has an h pipe welded into the exhaust right before the mufflers wich are 24 inch glss packs. So is it worth paying 300 bucks to get all the 2 inch exhaust taken out and replaced with 2 1/4 inch exhaust? It just makes me sick to think i have to shell out another 300 bucks just for pipe thats a quarter inch bigger... would it relly make that much of a difference? cause if it will then i shall get it replaced with 2 1/4, i was just told that 2 inch exhaust is plenty for a 360 specially a 360 in a four wheel drive truck. I been told the 2 inch would have a slight edge over the 2 1/4 in the low end torque compartment. this truck will never see anything over 6000 rpm and it will rarely go over 4700 rpm.i was hoping to hear the 2 inch exhaust pipe would be just fine and luck out for once