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SKU: 81-0221 | UPC: 024844015600
K&N 81-0221 Sintered Porous Bronze Fuel Filter 0.99in OD x 2.15in L - Universal Racing Fit
The K&N 81-0221 in-line fuel filter delivers reliable filtration for racing fuel systems with 1/4 inch lines. This sintered porous bronze filter handles high volumes at low pressure across gasoline methanol and oils in universal setups. It maintains fuel flow while trapping contaminants in performance applications.
Key Features
- Sintered Porous Bronze Construction: Filters fine particles from fuels without restricting flow in demanding race conditions
- 1/4 Inch Flange Diameter: Secure fit for standard 1/4 inch ID fuel hoses used in carbureted and injected racing engines
- 1 Inch OD x 2.125 Inch Length: Compact size installs easily inline with 0.625 inch flange OD for tight engine bays
- High Volume Low Pressure Design: Supports unrestricted fuel delivery up to racing demands without pressure drop
- Multi-Fuel Compatibility: Performs with gasoline methanol E85 and oils for versatile racing and custom applications
Product Notes
- Inspect and clean filter regularly to sustain peak fuel flow in high-contaminant environments
- Use in carbureted or EFI systems where inline filtration improves engine protection
- Packaged securely to prevent damage during transit
Installation Notes
- Professional installation recommended.
- Slide 1/4 inch ID fuel hose over barbed flanges and secure with clamps
- Compatible with AN-4 fittings or standard racing fuel line hardware
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| Universal | All | All Racing | High Performance Applications |
Why Choose K&N?
- Decades of motorsport filtration expertise ensures race-proven reliability
- Bronze material withstands harsh fuels and heat for long service life
- Engineered for precise micron filtration and maximum throughput
Frequently Asked Questions
-
Q: Will this filter work with my 1/4 inch fuel line setup?
A: Yes it fits directly on 1/4 inch ID hose with barbed 1/4 inch flanges for secure inline installation in racing systems -
Q: What filtration material does it use?
A: Sintered porous bronze captures contaminants down to 75 microns while allowing high fuel flow rates -
Q: What is the warranty coverage?
A: Backed by K&N limited lifetime warranty against manufacturing defects when used as directed
Shipping & Handling
- Method: UPS Ground
- Availability: In stock - ships same or next business day
- Packaging: Compact box 4in x 3in x 3in
- Weight: 0.1 lb
Air Intake Components
Air intake components control how filtered air enters the engine, directly affecting throttle response, power output, and fuel efficiency. Upgrading the intake path from the filter to the throttle body is one of the most accessible performance modifications available for nearly any vehicle.Popular UpgradesCold air intake kits are the most common upgrade, relocating the filter to a cooler area of the engine bay and replacing the restrictive factory airbox with a mandrel-bent tube for improved flow. Short ram intakes keep the filter closer to the engine for a more compact installation while still outperforming stock setups. Replacement performance air filters let you upgrade within the factory airbox without changing any tubing, which works well for vehicles where airbox location is optimal.What performance gains can I expect from an air intake upgrade?Gains depend on the vehicle and existing intake setup. Most naturally aspirated vehicles see modest horsepower increases in the 5–15 h...
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