K&N Panel Air Filter - K&N 33-2121-1

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  • Part#: 33-2121-1
  • Original Price: $116.99
  • Our Price: $65.99
  • Shipping: Free Shipping
  • Availability: Usually Ships in 1 business day
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K&N Replacement Air Filters

K&N Replacement Air Filters are drop-in replacements that will easily fit in your vehicle’s factory airbox. Compared to stock OEM air filters, K&N air filters are designed to provide better engine performance and are longer lasting. It delivers up to 50% more air flow, resulting in more horsepower and torque, as well as better throttle response.

It uses several layers of cotton fiber filter media in combination with air filter oil to trap unwanted contaminants such as dirt and debris and keep it from getting into your engine. An epoxy coated aluminum mesh protects the filter media from damage. The frame is made out of durable urethane that should last the entire lifetime of your vehicle.

In normal driving conditions, it can last up to 50,000 miles before it needs to be cleaned. To clean and service the filter, simply spray it with K&N Power Kleen Air Filter Cleaner to loosen and dissolve all the accumulated dirt and grime. It can then be washed with water. Once it’s dry, apply K&N’s Air Filter Oil prior to installation. K&N Replacement Air Filters come pre-oiled out of the box, so you’ll only need to apply new oil after it has been washed and cleaned.

With regular maintenance and using only K&N cleaning products, your replacement filter can last up to 10 years or 1,000,000 miles.



  • Drop in replacement for stock paper air filters
  • Fits in factory airbox
  • Delivers up to 50% more air flow
  • Increases horsepower and torque
  • Improves throttle response
  • Offers excellent filtration
  • Easily washable and reusable
  • Made with durable materials that should last the lifetime of the vehicle
  • Lasts up to 50,000 miles before requiring cleaning
  • Backed by K&N’s 10-Year/Million Mile Limited Warranty


Qty Sold: 1 Filter
Air Filter Shape: Panel
Filter Material: Cotton Gauze
Filter Re-Oiling Amount: 1.46 oz (43 ml)
Height: 1 in (25 mm)
Outside Length: 12.813 in (325 mm)
Outside Width: 7.688 in (195 mm)
Package Contents: 1 Air Filter
Product Box Height: 17.19 in (437 mm)
Product Box Length: 8.31 in (211 mm)
Product Box Width: 1.75 in (44 mm)
Product Weight: 1.42 lb (0.65 kg)
Weight: 1.4 lb (0.6 kg)
Installation Instructions

California Residents: Prop 65 WARNING

K&N Panel Air Filter 33-2121-1 is available for the following vehicles:

Please click on next to the vehicle for specific year information.
2004-2005 Chevrolet Classic
Year range Make Model Engine Type Liter Fuel Delivery
2004-2005 Chevrolet Classic L4 2.2L F/I
1997-2003 Chevrolet Malibu
Year range Make Model Engine Type Liter Fuel Delivery Notes
1997-1999 Chevrolet Malibu L4 2.4L F/I Position: Front
1997-2003 Chevrolet Malibu V6 3.1L F/I Position: Front
1999-2004 Oldsmobile Alero
Year range Make Model Engine Type Liter Fuel Delivery
1999-2001 Oldsmobile Alero L4 2.4L F/I
1999-2004 Oldsmobile Alero V6 3.4L F/I
2004-2004 Oldsmobile Alero L4 2.2L F/I
1998-1999 Oldsmobile Cutlass
Year range Make Model Engine Type Liter Fuel Delivery Notes
1998-1999 Oldsmobile Cutlass V6 3.1L F/I Position: Front
1999-2005 Pontiac Grand Am
Year range Make Model Engine Type Liter Fuel Delivery
1999-2001 Pontiac Grand Am L4 2.4L F/I
1999-2005 Pontiac Grand Am V6 3.4L F/I
2002-2005 Pontiac Grand Am L4 2.2L F/I
2004-2005 Chevrolet Classic K&N Replacement Air Filters, The K&N Replacement Air Filters is designed specifically to fit your 2004-2005 Chevrolet Classic without any modification to your beloved Chevrolet Classic. K&N Replacement Air Filters will also fit 1997-2003 Chevrolet Malibu, 1999-2004 Oldsmobile Alero, 1998-1999 Oldsmobile Cutlass, 1999-2005 Pontiac Grand Am.

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