R2C filters keep our engines the cleanest!  We had no engine wear issues in our 2010 WoO rookie year campaign and no engine went less than 1000 between rebuilds. R2C Late Model filters stop more dirt and are simple to maintain!

Austin Hubbard
Austin Hubbard
Hubbard Motorsports

CFD 4150 4 Barrel Direct Flow Air Cleaner Bases

CFD 4150 race air cleaner- 4 hole Direct Flow
Firepower CFD 4150 race air cleaner - 4 hole design

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 Now available in Show Stopping finishes!    


Available in Blue, Red, Purple, Lemon, Orange and Limited Edition Pink.


      Firepower AC10616BL finished in Electric Blue


s07 SummitRacing 132

Pbodies Decal Logo


SMI Logo 205




 Karl Logo

 And many other quality performance products dealers!




large0 1850C

Use Firepower Base AC10710 for this style and for tall, flat top choke housings.

1.39" Choke Tower Height.

large0 4779C

Use Firepower Base AC10709 for short and flat choke towers. 

1.05" Choke Tower Height.


CFD Designed holley 4150 air cleaner bases


Unlock the true potential of your race carburetor!

Introducing the most powerful and versatile racing air cleaner bases for Holley 4150 4 barrel applications!   Bolt-on double digit power gains.

Precision Booster Signal and entry profile Increases torque and provides crisp throttle response,  improved pull out of corners and additional straightaway speed.

Allows precision carburetors to perform as designed! 


The best Horsepower gain value available today! 


 easy power and torque gains

   +9 rear wheel horsepower gain on a 604 Crate from many 604 engine  specialists! 

   +16 engine horsepower gain on a Dirt Modified!



*Racer Advisory!

Concerns have been reported from Crate and Late Model racers that are making an attempt to utilize short air filters and steel raised air cleaner bases. These small filters do not have the capacity to hold dust without raising mid-race restriction to levels that will affect horsepower and response late in races.


An eye-opening example!:  Testing a 3" oiled gauze filter used on a Late Model that competed in a fairly dusty 50 lap event resulted in a loss of 47 Horsepower!


R2C CFD bases will outperform every air cleaner base made today. They are extremely strong, will not bend and deflect  and seal filters even under the most grueling circumstances.  Firepower CFD bases allow the use of large air filters which are vital for maximum, undisturbed air flow throughout the longest and dustiest of races. 

Do not be deceived and cause yourself unnecessary issues! As racers across the world know, the proven combination of an R2C Firepower CFD base and Pro Series race filter will serve you extremely well in every condition you will encounter! 





Months of design evaluation using CFD and flow bench testing, followed by extensive dyno and track tests (now well over 1000 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 conjunction with R2C Late Model/Modified air filter configurations, nothing comes close to the performance advantage R2C CFD 4150 4 barrel bases offer racers in applications from Stock cars to the highest horsepower open engines.

Firepower 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. Strong and durable, R2C CFD bases won't dent or deflect, causing filter sealing issues.

* Patents Pending

  • More Horsepower and Torque than any racing air cleaner base available today! 

  • 3 Forepower CFD 4150 shaped flow director configurations to choose from

  • Ultra strong composite Nylon Construction - No bending, dents and it runs cooler.

       Contact your favorite performance retailer


 Modified and Late Model Engines


       Dirt Modified dyno testing 

       680 HP Baseline

       696 HP using R2C Firepower  CFD 4150 race air cleaner base - w/2 pulls at +18 HP!

       Excellent power and torque gains throughout the power band.



       Attention 602 and 604 Crate Engine users

      maximum power to keep you in front!


          AC10617 Firepower CFD 4150 base and R10523 filter is the best combination.  

           Use lid AC10521 or AC10520  

        9-14 rear wheel horsepower gains!


      * Use AC10617 with HEI Distributors

Racer's: Contact R2C with Technical/Application Questions:  racing@r2cperformance.com




AC10615 Firepower CFD 4150 Air Cleaner Racing Base - 1" Height Above Flange - Open Flow Director  1 3/8" Drop
AC10616 Firepower CFD 4150 Air Cleaner racing Base - 1" Height Above Flange - 4 Hole Design  1 3/8" Drop
AC10617 Firepower CFD 4150 Air Cleaner racing Base - 2" Height Above Flange - Open Flow Director   3/8" Drop


AC10618 CFD 4150 Race System - Includes 3 Shaped Flow Directors, Base and gaskets.            
                                                                         Unassembled components for testing. (No Plungers)


R2C Firepower CFD 4150 bases and Flow Directors are now available for Holley carburetors that maintain choke housing such as the Double Pumper series, Street Avenger TM and Ultra models.

Bolt-On Double Digit Horsepower and Torque Gains!


  *Holley Ultra HP - Use Forepower AC10617 due to extended bowl length.

    Applications for Braswell 4825 carburetors available soon!


Base Dimensional Drawings


               AC10617 Base


                  AC10615  Base     




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