I'll snoop around more in my engine bay for an outlet. I've seen diagrams where there as a bracket bolted to the upper right corner of the radiator to aim the hose toward the grill but if I ever had one it is gone now. I don't have as much space for a tube compared to the pic in post #2, in part because my coolant overflow reservoir is right next to the oil/vapor separator. Also, the opening to my air canister is oval, not round, and points downward if that makes any difference. But thanks for the info.Most all of the factory airboxes I've seen had the tube (or provision for it and the tube went missing) or some means of pulling outside air ('snorkel' airbox that pops out into the wheelwell for example) in some form or another regardless of carb, SPICA or EFI.
Though I vaguely recall one version that had a large 'hat' on there where the tube would normally go, but dunno what model it came from.
Shouldn't be any impendance created by the system other than what a given material or density of the filter(s) impart.
If the volume of the box itself is of adiquate proportion everything balances out nicely.
Side note: lotta folks create an issue on thier own by going too small for replacement boxes, or worse yet, those little filters that have the pretty chrome solid plate covers that sits about 1~1 1/2" off the intake throat opening. Might as well poke holes in a half tennis ball and stick that on there if going that route as it'll flow about as well and doesn't cost nearly as much.