Here are some air intake modification for Suzuki Swift.
My favourite will be TryForce Intake kit as it still make use half of the original intake box design and it give more Torque and HP with dyno proven data too.
HKS Kansai Carbon Air Box Kit
HKS Suction Kit Reloaded Monster PFX400 Kit Simota Carbon Charger Kit Simota Carbon Short RAM Simota Drop In Suzuki Sport Intake via Fog Light hole Suzuki Sport Power Filter Suzuki Sport Induction Box Suzuki Sport Air Funnel Trust - Greddy Airinx B-Type TryForce Carbon Intake Kit