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Custom Assemblies > Custom Racing Assembly

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K&N Custom Air Filters for Single or Two Barrel Carburetors - K&N Custom Air Filter kits are designed to allow the maximum performance from your carburetors, yet keep the dirt on the outside where it belongs. These assemblies come with custom chrome top and base plates and the famous K&N High-Flow Washable Air Filter.

[More Information on Custom Air Filters for Single or Two Barrel Carburetors]
  • Designed to increase horsepower and acceleration
  • Show quality with custom chrome top and base
  • Washable and reusable air filter
  • High air flow with excellent filtration
  • One year limited warranty
Available Information
Installation Instruction Sheet
56-9158 Vehicle Applications

Part 56-9158 Product Specifications
Product Style: Custom Assemblies
Air Filter Color: Red
Air Filter Height: 2.469 in (63 mm)
Air Filter Inside Diameter: 5.344 in (136 mm)
Air Filter Material: Cotton Gauze
Air Filter Shape: Round Tapered
Inlet Diameter: 5.344 in (136 mm)
Mounting Hardware Included: Yes
Neck Flange: 5.344 in (136 mm)
Overall Height: 2.469 in (63 mm)
Replacement Filter: None
Style: Round
Top Material/Finish: Chrome
Top Style: Open
Air Filter Large End Diameter: 6.375 in (162 mm)
Air Filter Outlet Shape: Round
Base Inside Diameter: 5.344 in (136 mm)
Base Outside Diameter: 6.375 in (162 mm)
Clamp Material: No Clamps Required
Clamp Style: No Clamps Required
Color: Red
Filter Material: Cotton Gauze
Flanges: None
Height: 2.469 in (63 mm)
Inner Wire: No
Intake Pipe Ports: All intake tube ports needed for the specified applications are included
Mass Air Flow Sensor Adapter Included: Mass Air Flow Sensor Adapter Included When Required
Package Contents: 1 Air Filter
Package Quantity: 1
Size: 6-9
Top Inside Diameter: 4.469 in (114 mm)
Top Outside Diameter: 5.75 in (146 mm)
Vacuum Tubing Included: No
Weight: 0.95 lb (0.43 kg)
Product Box Length: 6.56 in (167 mm)
Product Box Width: 6.31 in (160 mm)
Product Box Height: 3.5 in (89 mm)

Customer Feedback      Be the first to review part 56-9158

I started using this filter. I ordered from your shop at my first oil change for my BMW G650GS as it's not a common part locally. Since then, I've never bought anywhere else. Always quick delivery, correct item, good price and no hassle. I hope you keep this product in your line-up and thanks for good service over the last +34,000 miles.
C. Ratliff, Phoenix, Arizona
I installed this filter in my 2008 BMW 528i in under 2 minutes from hood-up to hood-down. After starting the car in the garage I didn't notice any real difference in the sound but once I started driving it I could hear and feel the difference, especially in sport mode. And as an added benefit, it looks like my fuel economy has improved by about 1 mpg. According to the car's computer, in the 1,200 miles since I put it on, my average economy has gone from 25.2 to 26.2 mpg. Very happy.
Jim, Newbury Park, California
Great product. I got rid of the stock airbox on my 1993 BMW 740i. This filter fit right on the open intake hose. I have had it about 3 years and it instantly improved throttle response and the engine sounded better.
Jordan, California