This link is to Team-Integra I am by no means think that you should take one persons word as law but I have been looking at exhaust flow for a long time and this is right on the money.
http://www.team-integra.net/ti/performance/exhaust1.asp
This link is to Team-Integra also.It was written buy Michael Delaney who if any of were members of SHO or are members of Honda vision you know him as Tuan.
http://www.team-integra.net/ti/performance/exhaust2.asp
I don’t think that you have to be logged in to read this if you do let me know and I will post the whole thing.