The single snorkel air cleaner housing, its design, shape and filter size
have everything to do with clean & quiet operation (with minimal maintenance)
and nothing to do with "performance" beyond efficent operation. You'll note
that in the pre-emissions cars the snorkel is correctly angled forward so as
to catch hot radiator air; first, to help the engine warm up (fuel
atomisation) and, second, to keep carb icing away. An extra-heavy car with
numerically-low rear gears (like an Imperial) just ain't gonna REQUIRE a
great deal of air (especially with restrictive exhaust manifolding/tubing;
like an Imperial) as the carb can only flow as much fuel as the vacuum signal
from the motor will indicate. That is, it accelerates slowly because: 1)
mild cam; 2) restrictive intake/exhaust 3) tall tires/high gears 4) smallish
carb 5) Real, REAL HEAVY (like an Imperial) Something like this needs: a)
large cubic inch displacement
b) high compression ratio c) tight [low] stall torque convertor, because, it
can now have a carburetor very sensitive to slight throttle changes [driver
perceives less effort],
quiet intake and exhaust [same; plus car interior quieter], motor operates
"inside" of
envelope given it: ALL TORQUE. That's all the old luxury cars ever really
did was to torque around town. This is why, with the end of high compression
they turned into slow, gas-sucking pigs in comparison.
Put an open air cleaner housing on board and the noise level goes up, (big
deal), but mid-range acceleration/towing ability goes up. Add dual exhaust
and you're starting to get up towards the cam/convertor/gear combination
potential. Just be aware that with a stock carb fuel mileage can go down w/o
re-tuning, and the timing curve should be changed for optimization. (And
it'll take longer to warm up. Read about carb icing, too.)
Ross