Mishimoto Performance Air Intake - Honda Civic Si (FC) 2017-2020 - Blue

The Mishimoto Performance Air Intake replaces the restrictive factory airbox on the turbocharged 1.5L Honda Civic Si with a free-flowing, direct-fit system that is 37 percent less restrictive than stock. A steel wire reinforced silicone intake arm smooths airflow and holds intake air temperatures down better than a cast aluminum tube, while the black powder-coated steel airbox shields the high-flow filter from engine bay heat and positions it to reduce hydrolock risk. The venturi-style MAF housing straightens incoming air for a cleaner sensor signal, and the sealed box draws on the factory hood air diverter for a cooler charge. Dyno testing shows consistent gains of up to 4 whp and 4 wtq on the stock tune, and the kit bolts on with no tuning required.

Specifications

This part fits:

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy