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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've been using K&N filters since the 1970's on everything from my Hondas and KTM dirt bikes to my Ducati's and BMW, to my off road trucks and Corvette's. Have never had a problem in any way shape or form, as the saying goes. I'm sure my new turbo charged SUV will greatly benefit as well.
R. Allen, Sedona, Arizona
Excellent performance achieved after replacing my old paper air filter. Now my Peugeot runs more efficiently and I am helping the planet by not polluting it with old used air filters. Thanks for this super product!
Arturo Veloz, Oxnard, California
I've been using K&N air and oil filters for many years now, cars and motorcycles. The last car I had was a BMW 525i and I consistently calculated a 3-4 mpg (highway) improvement in gas mileage. I recently purchased a 2012 Infiniti M37 and am averaging 2-3 mpg improvement on the highway. I just like the fact I don't have to change the paper filters often and do notice better gas mileage on the highway which makes me feel a little better since I have to use premium grade. When I checked all the auto parts stores they didn't have them or told me they were on backorder. I called K&N directly and they were shipped out quick. Customer service was above average and worked efficiently. And if you ever decide to engineer and sell automobile CABIN FILTERS that have carbon/charcoal layer and are oiled with a light scent, SIGN ME UP! I hate changing the air filters so often. There is a model of the Infiniti that has a feature called Forest Air that people seem to love. Unfortunately, mine doesn't have it. Just sayin. Thanks.
Bo Lawrence, Austin, Texas