K​&N answered your engineering questions!

1w ago


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A couple of weeks ago, we gave you guys the awesome opportunity to ask K&N pretty much anything you wanted, and there were some cracking questions submitted. With K&N being the world leader in performance air and oil filtration, there were plenty of queries about replacing stock filters, horsepower gains and different intake configurations that are available.

The experts have taken the time to answer some of the best questions, so here’s what they had to say!

António Almeida – Will my carburettors need a retune to take advantage of a new K&N performance air filter?

K&N stock replacement filters are direct replacements for your OE filter, and should not require your carburetor to be retuned. However, if your carburetor is running lean with the stock paper filter, the added airflow from the K&N air filter may make your air/fuel ratio even more lean and may require re-jetting or tuning to bring your AFR closer to stoich.

Speed Freak – Why do you recommend oiling reusable air filters?

K&N replacement oiled air filters are designed to absorb dirt and dust particles instead of physically blocking them, allowing the pores in the material to continue flowing air. K&N filters are protected by a 10-Year/Million Mile Limited Warranty, and are engineered to last for the entire lifespan of your vehicle.

Josh Compton – Will putting on a performance air filter invalidate car insurance?

Because car insurance contracts vary greatly, it is best to speak to your insurance provider to find out your exact coverage limitations.

Ryan Thomson – Cone filter vs panel filter?

When fitting a conventional round filter on top of your engine—such as a carburetor, central fuel injector, or throttle body fuel injector—a large diameter, short filter will provide more airflow than a small diameter, tall filter. For example, a 10-inch diameter, 2-inch tall filter will provide more airflow than a 5-inch diameter, 4-inch tall filter. Where space permits, the height of the filter should be between 1/5 and 1/4 of its diameter.

The shape of the filter is less important if the application calls for a remote mounted filter, which includes many late-model fuel-injected vehicles. Typically, these vehicles will use a flat panel filter, or a conical/cylindrical shaped filter with a rubber mounting flange designed to be mounted on the end of the inlet hose.


Jack Scarlett Richardson – I'm loving the K&N intake that I've installed on my Golf GTI. What would you recommend as the logical next modification to compliment it?

We’re glad you are enjoying your new intake system! If you’re interested in performance upgrades, you may want to explore exhaust systems, headers, or a tune. If you’re more interested in improving your GTI’s handling, you might want to look into strut bars, suspension upgrades, or brakes. There are a lot of options out there!

Mike Fernie – What’s the process of sizing an air filter or intake system for a car?

New K&N filters are designed and reverse-engineered from a vehicle’s factory OEM air box to help ensure excellent fit, form, and function. Intake systems are developed by completely replacing the stock air box (or using components from the stock air box), paired with industry-leading computer-aided design, scanning equipment, and 3D renderings (where applicable). Multiple iterations of each intake design are tested to help ensure superior performance.

Dhilboy231 – What will you do when cars all go electric?

While we expect that the full transition to electric cars will be in the very distant future, we already offer cabin air filters for many electric vehicle models. We have also expanded our product line to now offer washable home air filters.

Notblackbear – Is there a product that you offer that may increase mpg?

Because there are many factors that can increase or decrease fuel economy (including driving habits, engine age, and maintenance), K&N does not make any claims or advertisements regarding fuel economy.


Stevograndio – Is it true that the oils from the K&N filters choke up the mass airflow sensor?

An unsubstantiated claim has circulated saying that K&N oiled air filters can cause mass airflow sensors to fail. K&N has thoroughly investigated this claim, and has found no evidence to suggest that K&N filter oil is able to cause MAF sensor damage. Over the past several years, K&N has compiled data regarding MAF sensors sent in by consumers and dealerships, which you can view here.

Tjayturner – How do you tell a genuine K&N product from a counterfeit?

Since there are increasingly more counterfeit products on the market, you should always purchase your K&N products either online from www.knfilters.com or from a K&N authorized dealer to ensure that you’re receiving the real thing. Some counterfeiters will go so far as to copy mold numbers and other information from legitimate K&N products and boxes, which makes it difficult to visually verify whether or not a product is truly from K&N.

Gtr_dropout – Why are all of your filters red?

K&N’s original red filter oil has been in use for decades, and has given our filters an iconic look that has become synonymous with performance filtration. We now also offer black filter oil, which provides an additional option for customization.

Thank you to everyone who submitted their questions and thank you to the guys and girls at K&N for taking the time to answer them!

If you want to see just how much power can be gained by a K&N product, click the link below!