Product Summary

Universal Fit, Solid Top Housing Style, Round Shape

  • Reduces your engine's air inlet temps
  • Filter elements available in several heights
  • Flat base increases airflow into the engine
  • Up to 12 hp increase over standard air cleaner
  • Includes a 1/2-inch Sure Seal air cleaner O-ring spacer

Comes as a Kit

Key Specs

MFG. Part #91605121
BrandSpeedway Motors

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Speedway Motors 91605121 Details

  • 14-inch spun aluminum air cleaner top and bottom for strength and great looks
  • Uses standard 14-inch diameter air filters
  • Up to 12 hp increase over drop base air cleaner
  • 1/2-inch Sure Seal air cleaner O-ring spacer included
  • Flat base increases airflow to carburetor/throttle body
  • Reduced air inlet temperatures
  • Cooler/denser air makes more power
  • Full 15-inch OD air filter element for more air flow but fits standard 14" base and top
  • Filter elements available in 3, 4, 5, and 6-inch tall heights
  • Filter element can be cleaned with compressed air (max 60 psi), or soap and water


Help Your Engine Breathe with Our Air Cleaner Kit

Our 14-inch Flat Base Air Cleaner Kit is just what your hotrod or race car needs to not only look its best, but to make more power too! This heavy-gauge spun aluminum air cleaner assembly features a single smooth radius for the airflow path, reducing airflow restrictions and turbulence commonly seen in typical “drop base” style air cleaners. These drop base air cleaners require the airflow to change direction twice as the incoming air moves up and over the drop base’s inner “bulge” for the air to reach your carburetor or throttle body. With our flat base air cleaner there are no restrictions, allowing increased airflow, which in turn makes more power! We’ve seen up to a 12 horsepower increase using this flat base air cleaner versus the traditional drop base unit. Further benefits of the flat base design include reduction in air inlet temperatures since the flat base pushes the filter media upwards into the air stream above the hood, moving the air cleaner out of the hot engine bay.

Constructed to Last and Custom Configurable to your Needs

With a cleanable and reusable filter available in 3, 4, 5, or 6-inch heights, you can choose the exact filter height to optimize your engine’s airflow needs and hood height. A honeycomb mesh screen on the filter stabilizes the filter media and prevents large debris from damaging the filter media. Included with the Speedway Motors 14-inch Flat Base Air Cleaner Kit is a 1/2-inch tall Sure Seal billet aluminum air cleaner spacer. The spacer incorporates a rubber O-ring for a positive seal to the base of the air cleaner (don’t forget that carburetor or throttle body gasket too!).

Easy One Click Ordering

Our 14-inch Flat Base Air Cleaner Kit provides quality kit contents at a great value in a single part number, making ordering easy! Pick your air cleaner kit up today with your choice of air filter and start feeding your engine cooler, denser air that will make you more power you can feel!


Kit Includes

  • (1) 14 Inch Flat bottom air cleaner base
  • (1) 14 Inch Flat bottom air cleaner top
  • (1) Sure Seal air cleaner 1/2 inch O-ring spacer
  • (1) Super Seal 15 Inch diameter Air filter (choice of 3, 4, 5, or 6 Inch tall element)

Speedway Motors 91605121 Specifications

MFG. Part #91605121
BrandSpeedway Motors
Housing StyleSolid Top
Fuel Intake TypeSingle 2/3/4-Barrel
Inlet Diameter (Fraction)5-1/8"
Overall Diameter15"
Base StyleFlat
Filter ColorWhite
Overall Height15.5"
Housing MaterialAluminum
Housing FinishNatural
Housing ColorNatural
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