direct air feed sealed from a large 1.6 airbox through a wire reinforced neoprene flexi ducting, sealed to the rear hole of the drivers side headlight unit, which acts like a kind of scoop.
Swirling is a left over trait from carby cars where the swirling helps to mix the air and fuel more efficiently.
When I complete my proper above engine air intake (ie: when I can afford the materials ) I do not plan on having any major curves or bumpy surfaces. It will be smooth.