K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's 10-Year/Million Mile Limited Warranty. K&N drop-in replacement filters are designed to install easily into your factory air box. Upgrade today and start enjoying superior airflow and superior performance from K&N's most popular product!
| Automotive Item Grade | High Performance |
| Cap Outside Diameter | N/A |
| Color | Heather Red |
| Filter Material | Cotton Gauze |
| Filter Re-Oiling Amount | 0.31 oz (9 ml) |
| Filter Style | Dry |
| Flange Angle | 0 Degree |
| Flange Inside Diameter | 0.000 in. (0mm) |
| Flange Length | 0.000 in. (0mm) |
| Frame Design | Flexible |
| Inner Wire | No |
| Inside Diameter | 5.750 in. / 3.500 in. |
| Inside Length | 5.750 in. (146mm) |
| Inside Width | 3.500 in. (89mm) |
| Item Height | 1.875 in. (48mm) |
| Item Weight | 0.500 lbs. (0.2 kg) |
| Machine Washable | Yes |
| Number of Flanges | None |
| Oil Included | Filter Is Pre-Oiled |
| Outside Diameter | 6.750 in. / 4.500 in. |
| Outside Length | 6.750 in. (171mm) |
| Outside Width | 4.500 in. (114mm) |
| Overall Length | 5.750 in. |
| Package Content | 1 |
| Package Contents | 1 Air Filter |
| Package Material | Paperboard |
| Package Quantity | 1 |
| Package Type | Box |
| Pre-Screened | No |
| Product Box Height | 7.250 in. (184mm) |
| Product Box Length | 4.630 in. (117mm) |
| Product Box Width | 4.630 in. (117mm) |
| Prop 65 (C, R or CR) | CR |
| Prop 65 Warning Label | https://www.knfilters.com/images/l/prop65.jpg |
| Shape | Rectangular |
| Title | K&N E-3951 Rectangular Air Filter |
| Top Material | None |
| Top Style | Open |
| WARNING CA Proposition 65 | Yes |
| WARNING CA Proposition 65 Message | WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov |
| Width | 4.250 in. |
WARNINGThis product can expose you to chemicals, including WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov which is known to the State of California to cause cancer or birth defects or other reproductive harm. For more information, go to www.P65Warnings.ca.gov.
K&N
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide...
K&N
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide...
K&N
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide...
K&N
K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide...
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K&N XD air filters use a Deep Pile Design, Extra Fine Weave Grade Cotton and alternate geometries for added efficiency and capacity for off-road conditions. This extra thick filtering medium...
