K&N® 57I-1000 - 57i Series Performance Induction Kit

K&N Performance Air Intake Systems
K&N® - 57i Series Generation II Induction KitK&N® - 57i Series Generation II Induction KitK&N®- Street LegalK&N® - 57i Series Generation II Induction Kit - Installation InstructionK&N® - Cleaning GuideK&N® - Done In House 602x420K&N Authorized Dealer
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57i Series Generation II Induction Kit (57I-1000) by K&N®. 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. Replacement Filter # RC-4550.

Notes: Not legal for sale or use in California.

K&N - F.A.Q. K&N - Air Filter Cleaning K&N - Warranty


  • 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
  • Street legal in most States
  • 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.

Brand: K&N       Part Number: 57I-1000       UPC: 024844097477
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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.

Vehicle FitmentThis part is compatible with 28 vehicle(s)
Year Make Model Fitment Notes
2005 BMW 325i 192 BHP
2005 BMW 320i / 325Ci / 325xi
2005 BMW 320Ci 2.2L L6
2005 BMW 325ti 2.5L L6
2004 BMW 320i / 325Ci / 325i / 325xi
2004 BMW 320Ci 2.2L L6
2004 BMW 325ti 2.5L L6
2003 BMW 320i / 325Ci / 325i / 325xi
2003 BMW 320Ci 2.2L L6
2003 BMW 325ti 2.5L L6
2002 BMW 320i / 325Ci / 325i / 325xi
2002 BMW 320Ci 2.2L L6
2002 BMW 325ti 2.5L L6
2001 BMW 320i / 325Ci / 325i / 325xi
2001 BMW 320Ci 2.2L L6
2001 BMW 325ti 2.5L L6
2000 BMW 323Ci / 323i / 328Ci / 328i
2000 BMW 320Ci 2.2L L6
2000 BMW 320i 2.0L / 2.2L L6
2000 BMW 325Ci 2.5L L6
2000 BMW 325i 2.5L L6
2000 BMW 325xi 2.5L L6
1999 BMW 323i / 328i E46
1999 BMW 320i 2.0L L6 E46
1999 BMW 323Ci 2.5L L6 E46
1999 BMW 328Ci 2.8L L6
1998 BMW 320i 2.0L L6 E46
1998 BMW 323i 2.5L L6 E46
1998 BMW 328i 2.8L L6 E46
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