When and why factory used dual snorkel?

not dual snorkel, but the 68-9 , ( 70?) roadrunner had the unsilenced air cleaner, that allowed in more air and the 70-1 340 had the breather with the slots on the side of it to help in air?? the 340 TA and 440 six pack breather with open element?

more air must have helped, but I also figure it had a lot to do with "image"?????

and image sold cars back then!???? and loud colors? and cute names? and little emblems on the side of the car????? etc etc etc Ha