Frequently Asked Questions

 

THE POWERFLOW DIFFERENCE

Why are our filters better?
Why is cotton gauze a BAD material?
How do filters work?
What's the difference between the asphalt and dirt filters. Are they different as far as flow and efficiency, different media altogether? I'm interested in a street/off road 14x3 filter. Thanks.
What's the best set up for 68 camaro with a 383 stroker running a Holley 750 double pumper. Street/strip use
Hello i would like to know if you have dominator carb base & insaerts
Is your cold air intake system for the 2006-2010 charger 50 state legal ?

Circle Track

Hi, Is there an independent study on CFM of R2C filter comparison among other top air filters?
Do you make a filter for the holley 4412 500cfm carb
We run asphalt late models, but our seriesrequires paper type filters. Color looks similar, but do you think this would pass a a paper type filter? Thanks
We run an off-road race truck. We are changing from a K&N to yours. We have run a flow thru top in the past. We will be running your 4412 base with your 5 inch tall filter. Should we run a flow thru top or not?
our class at thompsoms speedway in ct. only allows metal air filter bases, do you have anything in metal for a 4150 holley.
i run a 4777 holley and 80541 willys ...im looking to purchase new filters if.possible a new base as well 3"deep.so.air.cleaner.sits.lower i need product info to help me.buy this thru you
I use your R10501 filters for the past two years. I am running a 650+ HP modified for USMTS. I run a 4150 carb with an 1.25" round sure seal on the bottom of my base. Your 4150 bases look square, do you have anything for us? thanks
Which air cleaner base do you recommend for my application. Northeast Big Block Modified. open or 4 hole, 1" or 2". are there any clearance issues w/throttle linkage
We use a 4150 style Holley 4 barrel but it must have the choke tower. Do you have a base for that carb. if more than one, what are the depths?.....thanx.
I run a mini champ truck on asphalt.It is powered by a 2 stoke snowmobile engine.I found some kart racing filters that will fit on my carbs.Will these filters work on a 2 stroke engine?
Should I Run A Pre Filter Around Your Filter, I Have Outerware Pre Filters
The dimensions you provide for the Mini Sprint Car Air Filters, are they inside or outside measurements?
Is there military discounts available for active duty?
What issues are there from a dirt track filter getting wet from exposure to rain or heavy splash during an off road race ? Should it be shielded from such?
Which air filter base would be best for a 602 crate with a holley 4150 and a 6200 rpm rev limit?
I race an ashplat late model, what is the best filter i can use, hp is 450, we use both a 4150 650HP and a 4412, both using your bases, what would you recommend?We use a 14" x 4" Wix filter now. Looking for any advantage we can gain. Thanks
Running a 604 crate in IMCA A mod which base for the holley 4 BBL is LEGAL for IMCA ? Thanks
Is ac10617 cfd legal for imca northern sportmod 602 crate with 4150 carb

Filter Maintenance

Can I wash my R2C filter?
i have a r2c cai and i want to clean the filter but, where could i get the 40-60 compressed air?
Looking for replacement filter for oil type filters on other brands of cold air kit K & N Part # F060A6 2003 chevy 1500 SS w/6.0l 6" x 7.5" and a 07 Mustang GT with JTL cold air kit filter 4.5" x 9"
I have a 2006 Infiniti G35X with 84350 miles and the r2c air filter installed since 62000 miles and needed to know if it should be replaced or continue to just clean it with air and cleaning solution like stated with simple green, what is life of it?
i have r2c short dry ram air for my infiniti g37 2009 sedan. how can i clean my filter because air is not cleaning it very good, i live in hot and little dusty area
How often should the R2C filter on my Genesis be cleaned?
I have an r2c intake system for my 07 v6 mustang that needs cleaning. Compressed air is not doing a good job. Can I wash this or no? also what is the material of the filter?
I have the CY10803 filter. On moist evenings, the filters get caked with clay, that won't blow off when dry. Can they be washed like the Pro Series?

Sprint Car Base Systems

would the r2c ac10614 director fit on a quick fuel r850? it is a 4150 style dbl pumpr. thanks
Does the R2C AC10618 Kit come with the mounting hardware?? (To hold the base to the adapters!!!

THE POWERFLOW DIFFERENCE

Q: Why are our filters better?
A:

Check back daily!

R2C engineers will provide responses to your questions.


 

Most low-restriction air filters start with a sheet of cotton gauze, almost identical to the stuff used to dress wounds. We can all agree that cuts and high-performance engines have very different needs. So why is there a bandage in your engine?

Most "performance" filter companies (names withheld to protect the guilty) use gauze to achieve low air restriction. We use a patent-pending low restriction filter media that was designed specifically for engine intake filtration. R2C flow rates match or exceed that of the oiled gauze filters while dramatically improving engine protection.

All of our filters and intake systems are engine-specific so they maximize the performance of your vehicle.

back to top


Q: Why is cotton gauze a BAD material?
A:

Does someone have a bandage?
(Cotton gauze filter discussion)

During the course of our product development, we did a lot investigation on the low restriction products currently available to the auto enthusiast. Cotton gauze dominates this market and while all gauzes start out as the same white color, they then get tinted with various hues of oil.

There are red, blue and some green ones. We even saw one that was kind of orange (red gone wrong, maybe). One thing they have in common, regardless of their color, is they are all made from a material that was never intended to be used for filtration.

We were mildly amused by the descriptions some of these suppliers used to describe and justify the use of something other than a purpose built material for filters. Some counted the number of layers they used. Others described the gradient density of their layers, but the most telling was the one who proudly proclaimed their use of “medical grade gauze.” We still haven’t figured out what that has to do with protecting your engine, but it might come in handy if you’re injured while on the road.

What’s wrong with cotton gauze and what can do a better job?
The answer to that depends on what you expect your air filter to do. Being the old-fashioned type, we expect an air filter to protect our engine from airborne particulate and that means getting the highest possible filtration efficiency. If you can accomplish that at a restriction level equivalent to the gauze products, most people would agree they’d rather have higher effciency than lower.

back to top


Q: How do filters work?
A:

 

 

 

Most low-restriction air filters start with a sheet of cotton gauze, almost identical to the stuff used to dress wounds. We can all agree that cuts and high-performance engines have very different needs. So why is there a bandage in your engine?

Most "performance" filter companies (names withheld to protect the guilty) use gauze to achieve low air restriction. We use a patent-pending filter media that was designed specifically for engine intake filtration. All of our filter and intake systems are engine-specific so they maximize the performance of your vehicle.

back to top


Q: What's the difference between the asphalt and dirt filters. Are they different as far as flow and efficiency, different media altogether? I'm interested in a street/off road 14x3 filter. Thanks.
A:

R2C Drag and Pavement race filters feature a unique filter media that offers incredible airflow while providing excellent engine protection. The media is designed differently than our dirt racing filters due to the fact that pavement filters are not required to hold as much dust during competition.

R2C dirt filters offer more power once loading begins and minimize the in-race restriction that robs power when using paper or oiled gauze.

The Sportsman Series SSR10600 series would be an excellent choice for a performance Street Rod or Muscle Car.

back to top


Q: What's the best set up for 68 camaro with a 383 stroker running a Holley 750 double pumper. Street/strip use
A:

Use our AC10710 CFD 4150 air cleaner base and our new Black Hex Series street/race filters for unmatched power.

Top it off with our polycarbonate AC10521 air cleaner lid for the ultimate in looks and air flow!

back to top


Q: Hello i would like to know if you have dominator carb base & insaerts
A:

The Dominator CFD center Flow Directors are being finalized after extensive testing by engine builders, carburetor designers and tuners. They'll be released soon.

back to top


Q: Is your cold air intake system for the 2006-2010 charger 50 state legal ?
A:

We do not have CARB approval on this system.

Thanks

back to top

Circle Track

Q: Hi, Is there an independent study on CFM of R2C filter comparison among other top air filters?
A:

Our facility utilizes an ISO 5100 military certified test lab that produces results that are repeatable by any certified lab in the world. We rely on standard atmospheric conditions for testing and repeatability.

I'm sure there are several labs that have already tested R2C filters at the request of others. The data has not been shared.

back to top


Q: Do you make a filter for the holley 4412 500cfm carb
A:

Thanks for your inquiry.

Extensive dyno and track testing has revealed the R2C 4412 filter base and R10522 filter produce the most power. Advantages in torque occur at mid RPM levels and are maintained through peak. The bases are available in carbon fiber as well as composite for IMCA 2V racers.

Thanks for your inquiry.

Extensive dyno and track testing has revealed the R2C 4412 filter base and R10522 filter produce the most power. Advantages in torque occur at mid RPM levels and are maintained through peak. The bases are available in carbon fiber as well as composite for IMCA 2V racers.

back to top


Q: We run asphalt late models, but our seriesrequires paper type filters. Color looks similar, but do you think this would pass a a paper type filter? Thanks
A:

R2C race filters are used in many sanctions that originally required paper filters. Some R2C versions are hybrids in terms of media so they would be allowed.

back to top


Q: We run an off-road race truck. We are changing from a K&N to yours. We have run a flow thru top in the past. We will be running your 4412 base with your 5 inch tall filter. Should we run a flow thru top or not?
A:

Our recommendation would be to avoid the air cleaner tops that incorporate media. This is especially true when the filter top is exposed to high face velocity and airflow across the top of the filter.

Pressure drop issues may actually cause a detrimental effect across the booster/venturi. We have seen many that were wet with fuel on the clean side.

For maximum performance and engine protection, use R10522 or R10523 for this application if room allows.

back to top


Q: our class at thompsoms speedway in ct. only allows metal air filter bases, do you have anything in metal for a 4150 holley.
A:

Use our CFD air cleaner bases and request the metallic finish. They work extremely well!

 

 

back to top


Q: i run a 4777 holley and 80541 willys ...im looking to purchase new filters if.possible a new base as well 3"deep.so.air.cleaner.sits.lower i need product info to help me.buy this thru you
A:

Does the 650 double pump Holley still have a choke tower?

Regards,

R2C

back to top


Q: I use your R10501 filters for the past two years. I am running a 650+ HP modified for USMTS. I run a 4150 carb with an 1.25" round sure seal on the bottom of my base. Your 4150 bases look square, do you have anything for us? thanks
A:

Use base AC10617 for your application. We've experienced double digit gains according to the feedback from engine builders.  Thanks!

back to top


Q: Which air cleaner base do you recommend for my application. Northeast Big Block Modified. open or 4 hole, 1" or 2". are there any clearance issues w/throttle linkage
A:

Use the CFD AC10617 for best results across the power band on your application. In 450" + applications, it made excellent torque and power through 7500 RPM. The 4 hole is better in the higher ranges but gives up performance from 4500-7000.

 

 

back to top


Q: We use a 4150 style Holley 4 barrel but it must have the choke tower. Do you have a base for that carb. if more than one, what are the depths?.....thanx.
A:

back to top


Q: I run a mini champ truck on asphalt.It is powered by a 2 stoke snowmobile engine.I found some kart racing filters that will fit on my carbs.Will these filters work on a 2 stroke engine?
A:

back to top


Q: Should I Run A Pre Filter Around Your Filter, I Have Outerware Pre Filters
A:

Pre-filters are designed to keep large debris from becoming lodged in the air filter screen and media. They do not stop dust. Consider the track conditions that you'll face to determine if the pre-filter will be an asset during each event. They do add a small level of restriction.

 

 

back to top


Q: The dimensions you provide for the Mini Sprint Car Air Filters, are they inside or outside measurements?
A:

back to top


Q: Is there military discounts available for active duty?
A:

Yes we do..

As a long standing military supplier, we have a strong appreciation for our men and women in our services.

Thanks.

back to top


Q: What issues are there from a dirt track filter getting wet from exposure to rain or heavy splash during an off road race ? Should it be shielded from such?
A:

Regardless of filter manufacturer, air filters should be protected from heavy moisture conditions. Filters may become blinded if exposed to large amounts of water.

While our filters rely on a synthetic media and can be washed, water may temporaily restrict air flow through the pores.

Thanks.

back to top


Q: Which air filter base would be best for a 602 crate with a holley 4150 and a 6200 rpm rev limit?
A:

AC10617 and R10523 are a killer combination on the 602. Use lid AC10520 or 10521 to top it off.

Thanks

 

back to top


Q: I race an ashplat late model, what is the best filter i can use, hp is 450, we use both a 4150 650HP and a 4412, both using your bases, what would you recommend?We use a 14" x 4" Wix filter now. Looking for any advantage we can gain. Thanks
A:

Use our new Black Hex Series filter for your pavement race car. SSR10601b is the 4" version. Nothing in the world can flow like a Black Series race filter on your application.

Thanks

 

back to top


Q: Running a 604 crate in IMCA A mod which base for the holley 4 BBL is LEGAL for IMCA ? Thanks
A:

AC10617 CFD base will provide significant power gains and response and is legal in IMCA.

Thanks

back to top


Q: Is ac10617 cfd legal for imca northern sportmod 602 crate with 4150 carb
A:

back to top

Filter Maintenance

Q: Can I wash my R2C filter?
A:

R2C filters feature a specially designed media that allows performance and efficiency to be restored to near new each time by simply using compressed air from inside out, making washing  unnecessary to restore filter performance.

R2C Pro Series filters feature a media that is fully compatible with washing.  Biodegradable cleaners such as Simple Green or other mild shop degreasers can be used. Simply place the filter in a solution or spray the cleaner on the filter. Allow the solution to loosen the particulate and then rinse thoroughly. Shake the filter or use compressed air from the inside outward to remove residual water and allow a full day or two to dry. While the media may discolor and become light gray, filter efficiency and restriction are not affected.

R2C Sportsman Series filters are cleaned with compressed air only and are not to be washed.

back to top


Q: i have a r2c cai and i want to clean the filter but, where could i get the 40-60 compressed air?
A:

You can also use a shop vac to remove the dust on the outside of the filter if a compressed air source is not available.

back to top


Q: Looking for replacement filter for oil type filters on other brands of cold air kit K & N Part # F060A6 2003 chevy 1500 SS w/6.0l 6" x 7.5" and a 07 Mustang GT with JTL cold air kit filter 4.5" x 9"
A:

Use our new Black Hex Series to replace this cold air intake filter. You'll see immediate gains and won't have to oil again.

back to top


Q: I have a 2006 Infiniti G35X with 84350 miles and the r2c air filter installed since 62000 miles and needed to know if it should be replaced or continue to just clean it with air and cleaning solution like stated with simple green, what is life of it?
A:

back to top


Q: i have r2c short dry ram air for my infiniti g37 2009 sedan. how can i clean my filter because air is not cleaning it very good, i live in hot and little dusty area
A:

You can wash the filters in a solution of a biodegradable cleaner like Simple Green. Let them soak in the cleaner for an hour or so, rinse and blow the residual water out of the fiber structure from inside-out.

These filters dry very slowly!  I would suggest doing this when the car can be parked for a couple of days.

Thanks
R2C

back to top


Q: How often should the R2C filter on my Genesis be cleaned?
A:

In normal conditions, you can use compressed air from inside-out or vacuum the filter once each year. Thanks R2C

back to top


Q: I have an r2c intake system for my 07 v6 mustang that needs cleaning. Compressed air is not doing a good job. Can I wash this or no? also what is the material of the filter?
A:

You can soak the filter in a solution of Simple Green, etc. This will help with cosmetics although compressed air does restore performance.

Allow plenty of drying time as this synthetic media dries slowly.

Thanks

 

back to top


Q: I have the CY10803 filter. On moist evenings, the filters get caked with clay, that won't blow off when dry. Can they be washed like the Pro Series?
A:

Thanks for writing.

 

While not often necessary, the filters can be soaked in a cleaner such as Simple Green, rinsed and allowed to dry. This will improve cosmetics and concerns such as dried mud.

Normally, compressed air cleaning from inside out restores filter performance completely.

R2C

back to top

Sprint Car Base Systems

Q: would the r2c ac10614 director fit on a quick fuel r850? it is a 4150 style dbl pumpr. thanks
A:

Use our AC10700 series designed for the R4781 Holley DP. It works fantastic!

 

 

back to top


Q: Does the R2C AC10618 Kit come with the mounting hardware?? (To hold the base to the adapters!!!
A:

You can purchase the spring loaded plungers we offer or use 1/4"-20 fasteners to secure the CFD center flow director to the carburetor. 

back to top

Can't find what you are looking for?

Click here to ask your own question.

 
 

After alot of research, I finally purchased a filter for our Late Model and could not be happier. We ran paper filters before and had to run grease on the cleaner and it seemed dirt still made it through. Now with the R2C filter we do not have to mess with the grease and our carb is cleaner. We will now buy one for our modified.
 
Lueken Racing #12

Whats New

Bullitt Mustang Filter 
New Bullitt Mustang replacement air filters in Highland Green
View What's New with R2C
 
 

R2C Competition Filters

thumbnail image

For deep, flag-to-flag horsepower, Circle Track winners nationwide rely on R2C Competition Filters!

 
 
 
 
  • 350 Corporate Woods Pkwy Vernon Hills IL
  • P: 708.488.8211
  • F: 708.366.3563
 
 
Receive the latest news and special offers!