We use R2C filters on our cars because they eliminated the issues we had with dirt on the air cleaner base, in the carburetor and in our engines.  R2C filters are also easy to maintain. We can blow them out at the track and they're ready to go. No more filter oiling to deal with. 

Billy Moyer and Billy Moyer Jr.
Billy Moyer Racing

Asphalt Modified Air Filters

Asphalt Modified Air Filter
Black Hex Asphalt Racing Air Filter

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  • SSR10600B  14" x 3"
  • SSR10643B  14" x 3 1/2"
  • SSR10644B  14" x 3 3/4"
  • SSR10601B  14" x 4"
  • SSR10602B  14" x 5"
  • SSR10604B  14" x 6"
  • SSR10605B  14" x 4 3/4"
  • SSR10621B  14" x 5"
  • SSR10635B  11" x 6"
  • SSR10642B  11" x 4"


Asphalt Modified Air Filters


Racers..............Bolt on immediate Dyno-proven power gains!


R2C's new Black Hex Series race Air filters And CFD 4150 air cleaner bases provide double digit gains in horsepower and torque for Asphalt racing engines.


*New Black Hex Asphalt Race Series Filters

  • More Air and More Horsepower Than Any Filter Available Today. Up to 4x the flow rate of your current air filter!
  • Keeps Engines Clean
  • Reusable for Long Life Performance and Value
  • Simple Maintenance using compressed air and washable using Simple Green, etc.  No Oiling!


      2000 CFM capability!    Easily outflows WIX, Paper and Oiled Gauze Filters!


American Made Power!



CFD 4150 Air Cleaner Base

The Most Powerful Base/filter Combination in the World!

Months of design evaluation and flow bench testing, followed by extensive dyno and track tests (now over 1100 independent pulls!) conducted by the most respected names in race engine and carburetor assembly, have resulted in the best flowing, highest power producing air cleaner bases for Holley 4 barrel race applications. Every application from Stock Cars to unlimited Late Models and Big Block Modifieds have achieved significant gains in power and response/driveability.

R2C engineers developed each precision base shape to augment the venturi profile of the popular 4150 series Holley carburetor, resulting in dramatically smoother entry profiles and reduced restriction and a much stronger and consistent venturi/booster signal, allowing precision racing carburetors to perform at optimum levels and engines to produce increased power and torque. When used in conjuction with R2C Aspahlt Modified air filter configurations, nothing comes close to the performance advantage R2C CFD 4150 4 barrel bases offer pavement Modified racers.

CFD 4150 4 barrel air cleaner bases are offered in three configurations, allowing racers to select the precision contour that maximizes overall performance based on their individual applications.

* Patents Pending


* Never use an air cleaner lid which has filter media built into it.  This will severely disrupt booster signal and cause erratic carburetor operation when exposed to horizontal air flow as is the case with Asphalt Modified applications.




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