Top 10 K&N Air Filter 4 Inch Inlet – Automotive Replacement Air Filters

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1. K&N

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Washable, K&N Universal Clamp-On Air Filter: High Performance, Flange Length: 1.75 In, Premium, RE-0870, Shape: Round Tapered, Filter Height: 9 In, Replacement Filter: Flange Diameter: 4 In

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K&N #ad - Low-maintenance design: 50, 000 miles before your first cleaning under normal highway driving conditions. Trusted on the racetrack—made for your vehicle. Saves money: k&n high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters.

No-hassle warranty: 1-Year Limited Warranty. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains. A k&n filter will last longer than 10 disposable filters. World class protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants. High quality: Made in America. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%.

Race tested: the official air filter of NASCAR. Eco-friendly: using a washable, reusable product helps reduce replacement waste. Easy installation: pre-oiled and built with simple clamp-on design. Engineered power: state-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration.
BrandK&N #ad
ManufacturerK&N Engineering #ad
Height10.81 Inches
Length6.25 Inches
Weight1 Pounds
Width6.25 Inches
Part NumberRE-0870
ModelRE-0870
WarrantyLIMITED WARRANTY

2. K&N

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Flange Length: 1.125 In, Replacement Filter: Flange Diameter: 4 In, K&N Universal Clamp-On Air Filter: High Performance, Shape: Round Tapered, Washable, Premium, RG-1001RD, Filter Height: 5.5 In

#ad
K&N #ad - A k&n filter will last longer than 10 disposable filters. Trusted on the racetrack—made for your vehicle. Saves money: k&n high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters.

Race tested: the official air filter of NASCAR. Engineered power: state-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%. World class protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants. Low-maintenance design: 50, 000 miles before your first cleaning under normal highway driving conditions.

Easy installation: pre-oiled and built with simple clamp-on design. Eco-friendly: using a washable, reusable product helps reduce replacement waste. High quality: Made in America. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains. No-hassle warranty: 1-Year Limited Warranty.
BrandK&N #ad
ManufacturerK&N #ad
Height7.75 Inches
Length7.56 Inches
Weight1.73 Pounds
Width6.38 Inches
Part NumberRG-1001RD
ModelRG-1001RD
WarrantyLIMITED WARRANTY

3. K&N

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Flange Length: 1.5 In, RF-1040, Premium, Washable, K&N Universal Clamp-On Air Filter: High Performance, Filter Height: 7.5 In, Replacement Filter: Flange Diameter: 4 In, Shape: Oval Straight

#ad
K&N #ad - One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains. Race tested: the official air filter of NASCAR. Low-maintenance design: 50, 000 miles before your first cleaning under normal highway driving conditions.

High quality: Made in America. A k&n filter will last longer than 10 disposable filters. Engineered power: state-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. Eco-friendly: using a washable, reusable product helps reduce replacement waste. Trusted on the racetrack—made for your vehicle. Easy installation: pre-oiled and built with simple clamp-on design.

No-hassle warranty: 1-Year Limited Warranty. World class protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants. Saves money: k&n high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%.
BrandK&N #ad
ManufacturerK&N Engineering #ad
Height9 Inches
Length9 Inches
Weight1.27 Kilograms
Width9 Inches
Part NumberRF-1040
ModelRF-1040

4. K&N

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Flange Length: 0.625 In, Replacement Filter: Flange Diameter: 4 In, RU-2510, Shape: Round Tapered, Filter Height: 3.5 In, K&N Universal Clamp-On Air Filter: High Performance, Premium, Washable

#ad
K&N #ad - Easy installation: pre-oiled and built with simple clamp-on design. High quality: Made in America. Saves money: k&n high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters.

Trusted on the racetrack—made for your vehicle. Race tested: the official air filter of NASCAR. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%. A k&n filter will last longer than 10 disposable filters. World class protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants. Engineered power: state-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration.

No-hassle warranty: 1-Year Limited Warranty. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains. Low-maintenance design: 50, 000 miles before your first cleaning under normal highway driving conditions. Eco-friendly: using a washable, reusable product helps reduce replacement waste.
BrandK&N #ad
ManufacturerK&N Engineering #ad
Height9.13 Inches
Length4.5 Inches
Weight0.1 Pounds
Width5.5 Inches
Part NumberRU-2510
ModelRU-2510
WarrantyLIMITED WARRANTY

5. K&N

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Replacement Filter: Flange Diameter: 4 In, Shape: Round Tapered, Flange Length: 0.625 In, K&N Universal Clamp-On Air Filter: High Performance, Washable, Filter Height: 7 In, RU-2590, Premium

#ad
K&N #ad - Engineered power: state-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. World class protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants.

Saves money: k&n high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters. High quality: Made in America. Trusted on the racetrack—made for your vehicle. No-hassle warranty: 1-Year Limited Warranty. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains. Low-maintenance design: 50, 000 miles before your first cleaning under normal highway driving conditions.

Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%. Race tested: the official air filter of NASCAR. A k&n filter will last longer than 10 disposable filters. Easy installation: pre-oiled and built with simple clamp-on design. Eco-friendly: using a washable, reusable product helps reduce replacement waste.
BrandK&N #ad
ManufacturerK&N Engineering #ad
Height10.81 Inches
Length6.25 Inches
Weight1 Pounds
Width6.25 Inches
Part NumberRU-2590
ModelRU-2590
WarrantyLIMITED WARRANTY

6. K&N

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Premium, Washable, RG-1001BL, Shape: Round Tapered, Flange Length: 1.125 In, Filter Height: 5.5 In, K&N Universal Clamp-On Air Filter: High Performance, Replacement Filter: Flange Diameter: 4 In

#ad
K&N #ad - Easy installation: pre-oiled and built with simple clamp-on design. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%.

Race tested: the official air filter of NASCAR. Engineered power: state-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. Eco-friendly: using a washable, reusable product helps reduce replacement waste. World class protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants.

High quality: Made in America. Trusted on the racetrack—made for your vehicle. Saves money: k&n high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters. Low-maintenance design: 50, 000 miles before your first cleaning under normal highway driving conditions. A k&n filter will last longer than 10 disposable filters. No-hassle warranty: 1-Year Limited Warranty.
BrandK&N #ad
ManufacturerK&N #ad
Height7.75 Inches
Length7.56 Inches
Weight1.73 Pounds
Width6.38 Inches
Part NumberRG-1001BL
ModelRG-1001BL
WarrantyLIMITED WARRANTY

7. K&N

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Flange Length: 1.6875 In, Shape: Round Tapered, Replacement Filter: Flange Diameter: 4 In, Premium, K&N Universal Clamp-On Air Filter: High Performance, Washable, RC-4780, Filter Height: 9.5 In

#ad
K&N #ad - Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%. Trusted on the racetrack—made for your vehicle. Easy installation: pre-oiled and built with simple clamp-on design. Race tested: the official air filter of NASCAR.

High quality: Made in America. No-hassle warranty: 1-Year Limited Warranty. Eco-friendly: using a washable, reusable product helps reduce replacement waste. Engineered power: state-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration. Saves money: k&n high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters.

One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains. World class protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants. A k&n filter will last longer than 10 disposable filters. Low-maintenance design: 50, 000 miles before your first cleaning under normal highway driving conditions.
BrandK&N #ad
ManufacturerK&N Engineering #ad
Height7 Inches
Length14 Inches
Weight3 Pounds
Width7 Inches
Part NumberRC-4780
ModelRC-4780
WarrantyLIMITED WARRANTY

8. K&N

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RE-0850, Washable, Replacement Filter: Flange Diameter: 4 In, Flange Length: 1.75 In, Filter Height: 6 In, Premium, Shape: Round Tapered, K&N Universal Clamp-On Air Filter: High Performance

#ad
K&N #ad - Race tested: the official air filter of NASCAR. Low-maintenance design: 50, 000 miles before your first cleaning under normal highway driving conditions. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%.

A k&n filter will last longer than 10 disposable filters. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains. World class protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants. Eco-friendly: using a washable, reusable product helps reduce replacement waste. No-hassle warranty: 1-Year Limited Warranty.

Easy installation: pre-oiled and built with simple clamp-on design. Saves money: k&n high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters. High quality: Made in America. Trusted on the racetrack—made for your vehicle. Engineered power: state-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration.
BrandK&N #ad
ManufacturerK&N Engineering #ad
Height8.3 Inches
Length6.4 Inches
Weight0.8 Kilograms
Width6.4 Inches
Part NumberRE-0850
ModelRE-0850
Warranty1,000,000 Miles

9. K&N

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RF-1015, K&N Universal Clamp-On Air Filter: High Performance, Flange Length: 0.625 In, Filter Height: 7 In, Replacement Filter: Flange Diameter: 4 In, Shape: Round Tapered, Premium, Washable

#ad
K&N #ad - Race tested: the official air filter of NASCAR. Easy installation: pre-oiled and built with simple clamp-on design. Engineered power: state-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration.

Eco-friendly: using a washable, reusable product helps reduce replacement waste. Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%. Saves money: k&n high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains.

High quality: Made in America. World class protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants. A k&n filter will last longer than 10 disposable filters. Trusted on the racetrack—made for your vehicle. Low-maintenance design: 50, 000 miles before your first cleaning under normal highway driving conditions. No-hassle warranty: 1-Year Limited Warranty.
BrandK&N #ad
ManufacturerK&N Engineering #ad
Height10.81 Inches
Length6.25 Inches
Weight1.3 Pounds
Width6.25 Inches
Part NumberRF-1015
ModelRF-1015
WarrantyLIMITED WARRANTY

10. K&N

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Replacement Engine Filter: Flange Diameter: 4 In, Flange Length: 1 In, K&N Universal Clamp-On Air Filter: High Performance, Filter Height: 9 In, Premium, Washable, Shape: Round, RD-1460

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K&N #ad - Saves money: k&n high-flow replacement air filters will save you $250 over 10 years by avoiding disposable filters. Eco-friendly: using a washable, reusable product helps reduce replacement waste. Low-maintenance design: 50, 000 miles before your first cleaning under normal highway driving conditions.

Clogged or dirty air filters can reduce your vehicle’s acceleration by up to 10%. High quality: Made in America. No-hassle warranty: 1-Year Limited Warranty. Trusted on the racetrack—made for your vehicle. Easy installation: pre-oiled and built with simple clamp-on design. One of the easiest and most cost-effective upgrades for your vehicle for quick performance gains.

Race tested: the official air filter of NASCAR. World class protection: Pushing the limits of engine protection by protecting your engine from harmful contaminants. A k&n filter will last longer than 10 disposable filters. Engineered power: state-of-the-art filtration media provides up to 50% more airflow than disposable paper filters to increase power and acceleration.
BrandK&N #ad
ManufacturerK&N Engineering #ad
Height7 Inches
Length14 Inches
Weight2 Pounds
Width7 Inches
Part NumberRD-1460
ModelRD-1460
WarrantyLIMITED WARRANTY