57i Series Generation II High-Density Polyethylene Black Air Intake System with Intake Pipe by K&N®. Replacement Filter # RC-4550. Air Filter Height: 6" (152 mm). Air Filter Large End Diameter: 5.438" (138 mm). Air Filter Material: Cotton Gauze. Base Outside Diameter: 5.375" (137 mm). Clamp Style: Regular. Flange Inside Diameter: 4" (102 mm). Flange Length: 0.625" (16 mm). Flange Type: Centered. Height: 6" (152 mm). Intake Pipe Finish: Black. Intake Pipe Material: High-Density Polyethylene. Top Outside Diameter: 4.5" (114 mm). Top Style: Chrome. Includes: 3 Clamps, 1 Cuplers. This kit improves airflow into your engine. It includes a K&N air filter and a custom designed air intake tube. The K&N filter increases the airflow and the intake tube smoothes that airflow into the engine. The result is more horsepower and torque, and better acceleration you can feel.
- Guaranteed to increase horsepower and improve acceleration
- Custom designed and engineered for each application
- Works with OEM computer system
- Includes the world's best air filter, the K&N filter
- Easy to install
- Up to 100,000 miles between servicing
- Million Mile limited warranty
The K&N 57i Series Generation II Induction Kit improves intake airflow from the air filter all the way to the throttle body. The system starts with the world famous K&N high flow air filter. K&N uses the largest conical shaped air filter that will fit in the engine compartment. The large increase in filter area over the stock airbox filter results in a huge increase in airflow and a greater capacity to capture and hold dirt.
The filter is attached to a precision molded intake tube that connects the filter to the throttle body. The tube is precisely designed to reduce turbulence and accelerate airflow into the engine. The rotationally molded intake tube is made from interlaced high density Polyethylene, reducing intake air temperature from similar metal tubes. Intake air temperature is further reduced by a heat shield that isolates the filter from the engine compartment. The reduction in air intake temperatures results in a cooler, denser air intake charge and even more horsepower. Some applications may also include an additional flex tube for cold air applications.
K&N uses a dynamometer to design its air intake kits to make the most horsepower possible. But their power figures aren't based on just one vehicle, but rather an average of runs by a number of vehicles. This means repeatable numbers and horsepower claims you can count on.
Every 57i Series Generation II Induction Kit comes complete with everything necessary for installation, including comprehensive installation instructions. All adapters are manufactured from high quality materials such as steel, aluminum, silicon or reinforced nylon, to ensure long life. The K&N filter can go up to 100,000 miles before cleaning is required. And the K&N air filter is guaranteed for one million miles.
K&N® is the inventor and leading innovator of reusable cotton gauze filter technology for automotive applications. The first K&N filter was conceived for racing over 40 years ago and a performance enthusiast mindset continues today throughout all levels of the company. K&N is the sales and brand leader for performance filters, including an extensive line of factory replacement filters and performance air intake kits. The company actively promotes the environmental, economical and performance advantages of long-life reusable cotton gauze filters.