Exhaust Pipe Diameter 273

I have a 66 cuda with a 273 2 bbl motor [running a 4bbl intake] stock manifolds I have a true dual 2 1/4 system [no x or h pipe] 1 7/8 head pipes [to the bottom of firewall] stepped up to 2 1/4 stepped up to 2 1/2 at the mufflers and tips. I'm running Magna flow Magna packs [stainless straight thru] mufflers with stainless oval tips. Sounds awesome [quite loud] inside and out. My exhaust guy asked what I was wanting and I said I wanted to make small children cry when it was running he gave me what I wanted.