Add horsepower and sound to your Civic Si with the new Mishimoto Civic Si Performance Air Intake. This kit is engineered specifically for your 2006-2011 Honda Civic Si and includes everything needed to replace the restrictive stock airbox. This dyno-proven air intake provides 8 hp and 6 tq gains over the stock intake. Installation is quick and simple, perfect for some extra punch on the street or autocross course. The Mishimoto Honda Civic Si Performance Air Intake includes everything needed for installation, installs in under one hour, and works perfectly with the stock tune. The mandrel-bent aluminum intake pipe is available with a polished or black powder-coated finish. This pipe utilizes a CNC-machined mass airflow sensor (MAF) housing to provide accurate and consistent MAF readings, which translates into a smooth power band. To reduce air intake temperatures, a powder-coated heat shield is placed between the air filter and hot exhaust manifold, significantly reducing heat-soak. The Mishimoto free-flowing air filter provides an 85% greater surface area, optimal airflow, and proper filtration of dirt and debris. The included Mishimoto oiled air filter is completely serviceable, allowing for a lifetime of reliable use. Additionally this Civic Si intake kit includes a silicone coupler, clamps, and all other hardware necessary to complete a quick installation for easy bolt-on power. Along with an upgrade in power, this Civic Si intake also provides an aggressive and rich intake tone that is a huge improvement over the stock intake, especially when VTEC activates. The Mishimoto Honda Civic Si Performance Air Intake is designed in Delaware, USA and includes the Mishimoto Lifetime WarrantyFeatures:Direct fit for 2006-2011 Honda Civic SiDyno-proven maximum gains of up to +8 whp and +6 wtqOptional black powder-coated heat shield keeps unwanted hot air from entering the air filterHighly aggressive intake tone under accelerationInstalls in less than one hour with no need to remove the front bumper or splash guardAvailable with a polished or wrinkle black intake pipeDesigned in Delaware, USA and filter made in USACARB EO #: D-759-1Mishimoto Lifetime WarrantyPipe Diameter: 2.75"Airbox Material: AluminumOiled Filter: 38 g of oil on filterPipe Material: Mandrel-Bent AluminumChassis Codes: FG2 | FA5Engine Codes: K20Z3Oil Color: RedHeat Shield Material: SteelMax Gain: 8 hp and +6 tq at 6200RPMPurchase Includes (1) Aluminum Intake Pipe with CNC MAF Flange | (1) Silicone Intake Coupler | (1) High-Flow, Oiled Filter | (1) Heat Shield w/ Protective Edging | (2) 60-80mm Worm Gear Clamps | (1) 16-25mm Worm Gear clamp HardwareFitment/s:Honda Civic Si 2006-2011Note/s:22 in-lbs (2.5N*M) recommended for all worm-gear clamps.These clamps have an operating range of 18-27 in-lbs 2-3N*M.Do not exceed the maximum torque rating of 27 in-lbs (3N*M).Mishimoto recommends that his intake is not used with the stock ECU programming. It is highly recommended that the customer retune the vehicle's ECU after installing the intake. Power gains will vary depending on the type of ECU tune that is applied to the vehicle.