50 State Legal. This part is legal for sale and use on Emissions Controlled Vehicles in all 50 states when used in accordance with the manufacturer's application guide because it has a California Air Resources Board (CARB) Executive Order (EO) number: CARB EO: D-759-8
Direct fit for the 2017-2021 Honda Civic Si
Dyno-proven maximum gains of up to 4 whp and 4 wtq on the stock tune
37% increase in flow over the stock intake system
Smooth design eliminates restrictions and improves airflow
Highly aggressive intake tone under acceleration
Aluminum CNC-machined MAF housing specifically designed for the Si sensor to retain safe air to fuel ratios
Powder-coated black airbox keeps unwanted hot air from entering the air filter
Mishimoto High-Flow Oiled Air Filter receives maximum airflow from the front of the vehicle
Designed in Delaware, USA and filter made in USA
Mishimoto Lifetime Warranty
Our performance air intake for the 2017-2021 Honda Civic Si is finally here! This intake was engineered specifically for the new turbocharged Civic and is a direct-fit modification that will provide enhanced engine performance and improved throttle response. Plus, it will add a little flair under the hood! This intake has a noticeably unique and aggressive tone under acceleration and boost. The steel wire-reinforced silicone intake arm improves airflow and keeps intake air temperatures under control as opposed to an aluminum design.
The black powder-coated steel airbox covers and protects the Mishimoto high performance air filter from engine bay heat, while also eliminating the possibility of hydrolock with the placement being closer to the hood. The box makes use of the stock air diverter found right underneath the hood, which is used to direct airflow into the stock airbox. The MAF housing has a venturi-style inlet, improving the airflow compared to the conventional MAF housing design. This intake makes consistent dyno-proven gains of about 4 hp and 4 ft-lbs of torque and was designed in the USA at our Delaware headquarters. This unit is a complete bolt-on part that functions perfectly with the stock tune and includes the Mishimoto Lifetime Warranty, ensuring superior product quality and craftsmanship.