Need some tech help on exhaust boxes

hough

Road Burner
Points
67
From
Poole, England
Car
VW T5 swb 2.5tdi
hey can anyone give me some help on exhaust silencers, as far as i know from reading different sites the longer the box the quieter the exhaust note becomes but how does the diameter of the box/oval change the sound of the exhaust as in, would a 6" dia cylinder have a lot deeper note than a 4" cylinder, and what would be the difference in exhaust note/sound between say a single 67mm dia exhaust system with 2 12" x 5" cylinders and a twin 52mm dia exhaust with 4 12" x 5" cylinders (2 silencers per a exhaust pipe?)

i hope this question makes sense.......
 

hough

Road Burner
Points
67
From
Poole, England
Car
VW T5 swb 2.5tdi
thanks old git this thread was good, but what i realy want to try and find out is if i was to compare a few exhausts side by side ie a 6" dia cylinder 12" long, a 4" dia cylinder 12" long and a twin oval 5" x 8" again 12" long, i know the 6" is deeper sounding to the 4" but how would the oval compare to the 4" and 6" cylinder?

also as far as i under stand im i right in saying 1 x 3" bore in a 6" dia cyinder would be louder and deeper than say 2 x 2.25" bore in a 4" cylinder (thats 2 x 4" cylinders side by side)
 
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