Exhaust tube Diameter

[customizer76]

Well it's me again needing a little help from my Chevy community. Question of the day for me is now, that i have these new high dollar headers for my 79 c10. What size pipe to run for around 450 to 475 flywheel horses, yes i like the 3" but do i really need to go that big for this? I was told by some that 3" will give me more noise. Looking to not upset neighbors but dont wanna choke off my truck either going to small or getting 3" and not need it. The headers are the Hedman 1 3/4 runners down to which ever collector i wanna use 3 or 2.5.