from personal experience I have noticied that the small diameters have a higher/ louder pitch while the larger ones have a lower/deeper sound. Not sure it would matter since most of the time it comes down to the muffler anyways.
when i took my cbe off we ran the stock dp by itself.. damm that was the best sounding exhaust ever.. so f'n throaty.... i was think bout leavin it that way!!! it was hella loud, and never got ricey.. wewent all the way up in rpms. it always sounded awesome.. this was in my school auto shop, while the car was on a four post lift.. we shook the windows and the school got mad at how loud it was!!!