Proper Exhaust Diameter fo a 4bbl 225?

It's what it's all about.Doing what YOU want, with what you want.
I got chastised severely over the years about having 4 door cars and lowly Slant Six engines.
I once had a very clean 66 Charger with a small block. Was told what a waste,It should have a Hemi.
Who cares what others say or do. It's yours. Sad they don't see what we do.
Ok, rant over. Back to our regular scheduled program.:)