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air intakes

Good for 18.5WHP / 13WTQ Power Gain – CARB EXEMPT EO# D-436-22

Just announced… STILLEN cold air intakes for Nissan and Infiniti vehicles have been granted CARB EXEMPT EO#’s through 2014! For over 20 years, STILLEN has worked with the California Air Resources Board (CARB) to develop products that are compliant with OE standards of total vehicle integration and performance while still satisfying emission control regulations. With this long history in mind, STILLEN is proud to announce the cold air intakes for the Infiniti Q50 and Q60 have been granted CARB EXEMPT Executive Order numbers. These numbers mean that the part has been shown not to alter or modify the design or performance of the factory emissions control equipment. While a typical aftermarket intake will automatically fail visual inspection, intakes with a CARB EO# will not fail a visual inspection, allowing the car to still be emissions tested as usual. We are equally proud to announce year range extensions for the 2014 370Z , Maxima and more. For a full list of vehicle applications, please see below.

STILLEN was the first company to prove that a cold air intake on the VQ37 engine could actually make power and is still recognized as the leading cold air intake with the highly sought after Generation 3 long tube cold air intakes for the 370Z, G37 and Q60.   It took 6 months of in-house R&D and testing and 56 different variations of prototype intake systems but it was all worth it and the end result was the leading cold air intake for the VQ37 equipped vehicles.

Nissan Titan Air Intake

STILLEN Air Intake for Nissan Titan CARB EXEMPT EO# D-436-22 is good for a 15WHP / 27WTQ Power Gain At The Wheels

When it came time to manufacturing air intake systems for vehicles like the Altima, Maxima, Titan, Frontier, etc. STILLEN leaned on its vast experience in manufacturing high performance parts for NISSAN/INFINITI vehicles.  On the Nissan Altima and Maxima applications STILLEN is the only manufacturer of high performance intakes that incorporates a poly-urethane ducted air intake path leading fresh air from behind the factory grille directly into the air intake filter.  Included in many of these kits is STILLEN’s unique velocity ring which increases the velocity of the air as it is drawn into the engine thus producing more power!

Note: The California Air Resources Board (CARB) is a division of the California state government and is widely recognized for having the most stringent emissions control regulations in the United States. Therefore, each of the 50 states recognizes its standards as the emissions standard for all performance parts. Each performance part that achieves CARB EXEMPT status is considered 50-state legal.

STILLEN CARB EXEMPT Cold Air Intakes (EO# D-436-21)


Contact Us

For more information about the STILLEN cold air intakes, please browse our website or call (866) 250-5542 to speak with one of our experts.

Here at STILLEN, we love cars and the Infiniti Q50 is no exception. This car has already become a favorite among the STILLEN team, so it’s no wonder that we’ve been hard at work developing brand new performance parts that will squeeze every ounce of power, sound and performance out of this car. Just a few months ago, we introduced you to the STILLEN 504440 cat-back exhaust for the Infiniti Q50 (read more about this exhaust our blog post by clicking here) and now we’re proud to introduce you to the STILLEN 403230 Generation 2 Dual Cold Air Intake Kit for Infiniti Q50.

STILLEN Infiniti Q50 Air Intakes

STILLEN Infiniti Q50 Air Intakes

History of Excellence

The STILLEN R&D team has a long history of developing top of the line air intakes for the Nissan and Infiniti cars and chose to incorporate many of these principles in the Infiniti Q50 Gen2 cold air intakes. Like our other Gen2 intakes, this Infiniti Q50 air intake kit comes with polyurethane heat shields that effectively direct air inside the engine bay to maximize performance.

Infiniti Q50 Intake by STILLEN

Impressive Sound

While many of us upgrade to aftermarket intakes from the stock intakes for the performance gains, sound is also another reason to upgrade. Aftermarket intakes just sound better and this is definitely true for the STILLEN Cold Air Intakes for Infiniti Q50. With these hi-flow intakes you can enjoy a mild sound while cruising, but also enjoy a richer sound as the engine comes to life under acceleration.

The Best Cold Air Intakes for Infiniti Q50

Heat shields and sounding good aren’t the only reasons we believe the STILLEN Generation 2 Dual Cold Air Intake Kit is the best cold air intake available. Here are a few more reasons why we like this cold air intake:

  • Twin mandrel bent polished aluminum intake tubes
  • Comes with two K&N Filters
    • 1,000,000 mile warranty on filters
    • Dual cone integrated with velocity stack
  • No check engine light (CEL) problems – guaranteed!
  • 50 State legal
  • Customizable – paint the urethane intake boxes to match your car or leave natural black
  • Hassle-free, bolt-on installation with easy to follow instructions
  • Made in the USA

STILLEN Cold Air Inake Installed in Infiniti Q50

Next Steps

For more information about the STILLEN Cold Air Intakes for Infiniti Q50 or browse our selection of other Infiniti Q50 parts, please visit www.STILLEN.com. We specialize in a wide variety of performance parts just give us a call at 866-250-5542 and we will be happy to answer any questions you have about cold air intakes or any of the other parts we carry!

You want to go faster, have a more responsive acceleration and improve the fuel economy of your car? Some may think that this is too much to ask for, but the truth is it is possible and the answer is simple: Get a new air intake kit for your car or truck. Air intakes not only make your engine more powerful, but they also make your engine more efficient. Plus, you get the added benefit of a better sound and improved performance!


Generation 3 STILLEN Cold Air Intake for Infiniti G37

Why Performance Air Intakes Are Better Than Stock Air Intakes:

When designing a vehicle the factory engineers are constantly dealing with compromises. Engineers will build the best vehicle imaginable. Then another set of engineers come in and make sure that vehicle will work for 99.9% of all people. From the young, aggressive, enthusiastic teenager to the middle-aged businessman and the little old lady using the car as a mode of transport. Once the car has been toned down enough for “everyone” to enjoy the accountants come in. Their job is simply to cut costs. Is the door handle necessary? Does the car really need a windshield? We joke, obviously, but the general job is to reduce costs as much as possible. In many cases their reducing the cost of the car without actually reducing the part, working with vendors to streamline their shipping processes, making adjustments to their manufacturing plants so they run more efficiently. Now you may be asking yourself, “what does this have to do with a cold air intake?”

By the time the vehicle has gone through the various levels of engineering, there have been compromises made for various reasons. The end result is a vehicle that has been de-tuned, and softened up. In some cases this is good, in others such as vehicle performance this means the engine isn’t breathing as well as it could and the performance isn’t as optimal as it could be. This is where we come in. As automotive enthusiasts, we want to hear the air intake. We want to hear the engine breathing. We want to feel the additional power. All of this becomes the character of the vehicle. To accomplish this there are a few things we do differently.

  1. Most vehicles come with a flexible intake tubing that looks like accordion tubing. This tubing creates turbulence as the air passes through. The turbulence is created by the riffles inside of the airstream. The goal when developing a cold air intake is to achieve a laminar airflow through the intake piping.
  2. Additional benefits can come by way of a larger air filter. Factory air filters are generally referred to as “panel filters” as they are simple drop-in squares or rectangles. Most performance intakes take advantage of an oval, circular, or more three dimensionally shaped filter. This allows for a larger surface area thus allowing for better filtration, less restrictive airflow.
  3. In most cases the factory air intakes are undersized and can create a bit of restriction in the intake path. By going with a larger diameter tubing it allows for a larger volume of air to be available to the engine.
  4. Some companies such as Injen technologies will manipulate the airflow to increase the velocity of the air as it travels through the intake piping.
  5. Some companies like AEM performance intakes will include a supplemental computer which can be attached to the factory MAF sensor to alter the signal being sent to the factory ecu. AEM calls this their ETI intake system or electronically tuned intake systems.
  6. When reviewing a cold air intake, the name itself tells the story. The goal is to simply draw air from the coolest place possible. By relocating the vehicles air intake location outside of the engine bay you are getting fresher, cooler air.

STILLEN dry filter

Why It Works:

Unlike stock air intakes, the design of aftermarket air intakes promote improved air flow into your engine. This increases the amount of oxygen that can be used for combustion. In turn, having additional air in your engine allows it to be more efficient – both in terms of horsepower and fuel efficiency.

Air is just like anything else in this world. It is made up of molecules and all molecules expand and contract depending on the temperatures in the environment they’re in. As the temperature increases the air molecules grow larger. As the temperature decreases the air molecules shrink and therefore become more dense. By reducing the temperature of the air you are effectively making the air more dense and the same volume of air becomes more oxygen rich.

To get the lowest ambient air temperature possible you have to move the air intake location as far outside of the engine bay as you can. This is the reason we relocate the filters and intake pickups to the front bumpers or between the fender and chassis rails. The goal is always the same, move the intake port to the coolest area getting the most direct airflow as possible.

Types of Intakes Available:

Cold Air Intakes

There are two different types of cold air intakes. Traditionally and most obvious are the intakes that re-locate the air intake pickup to outside the engine bay. These usually require a bit more mechanical knowledge as often times you’ll need to remove body parts such as bumpers or windshield washer bottles.


The other type of cold air intake looks similar to a factory intake with a sealed air box. The primary difference is that the air box is generally larger and in most cases re-routes its air intake location to somewhere outside the engine bay. In some cases these sealed boxes can employ ram air scoops with air being directed from lower parts of the vehicle such as behind the front bumper on many full-size trucks.

Many people prefer the OE looks of this style of intake. You also get a large air filter, and a larger air box which allows for a larger air reservoir for the engine to pull from. In most cases, these systems are the easiest “cold air intakes” to install.


STILLEN Cold Air Intake Airbox for Nissan Titan is CARB Exempt (EO# D-436-14) and good for 15whp / 27wtq

Why We Like Them:

  • Offers the highest horsepower for basic applications
  • Prevents Ingestion of Hot Engine Bay Air
  • Sealed Airbox Design WILL DRAMATICALLY Outperforms an Open Intake In Traffic or Hot Days

Short Ram Intakes

These systems are identified by their short, single tube design with an open air filter at one end. If you are looking for an upgrade in throttle response, then this is the air intake for you. Another major difference between the short ram intake and cold air intake is that the short ram intake is generally louder. In most cases this type of air intake is the easiest modification you can make to your vehicle. It’s even easier than changing the oil or headlight bulbs on most vehicles.

Why We Like Them:

  • Offers a distinctive sound and improved throttle response
  • Simplicity

Make Sure Your New Air Intake is CARB EXEMPT:

It is important to know your states laws and regulations regarding performance parts on your vehicle. In most states as long as you don’t have any check engine lights your vehicle will be passed and you will receive your registration quickly and easily. However if you live in a state that follows the CARB regulations (California Air Resources Board) you will want to make sure that the cold air intake you are installing is legal for use and operation on the roads in your state – intakes that are permissible for use in California will feature a CARB EXEMPT Executive Order number, that exempts that part from emissions regulations. Currently there are only a few states that have adopted CARB regulations, but more states integrate these regulations every year.

If you purchase a CARB EXEMPTED intake, your kit WILL come with a decal which you will want to place somewhere inside your engine bay. We recommend sticking it next to your vehicles factory emissions decals generally located under the hood. Another easy to locate place is on the front core support directly above the radiator.

Dry Filters vs. Oiled Filters

For years the debate has raged on, dry filters are better than oiled filters, oiled filters have better filtration capabilities than dry filters. The factor of the matter is, both types of filters work very well. These days filter technology has come so far and is so good that it really comes down to user/owner preference.

Airaid oiled filter

Oiled filters will not damage your MAF sensor. K&N engineering is recognized as being the first company to employ oiled filters in their intake designs. They have been testing their oiled filters for decades and continue to test their filters and oils against the latest technology coming out from the OE’s. Every time they test their products they find that there is no damage being done to electronic components or engine internals caused by their oils. For more information on this visit the K&N website here: www.knfilters.com/maf/massair.htm

Dry filters do have the added benefit of not even being able to bring up the question about oiling issues or anything like that. As the filter is completely dry there is no way oil can get onto electrical components or into the engine. If you find yourself uneasy about the idea of using an oiled filter even after reading all of the information provided earlier, a dry filter is going to be your best option. Another side benefit is that a dry filter is typically easier to clean


STILLEN is the only major retailer who also designs and manufactures their own cold air intakes, and we make it all RIGHT HERE, in the USA at STILLEN HQ in Costa Mesa. Founded by Champion Racer Steve Millen, STILLEN has been manufacturing cold air intakes since the early 90’s, applying our championship-winning race engineering experience to our line of performance parts for street vehicles. After all, if we can build an 800HP race car, why wouldn’t we be the people to trust with your street car? STILLEN has been working with CARB to achieve exemption orders for many products since 1995. Not only do we carry all of the major manufacturers such as Injen, Airaid, Volant, K&N, AEM we also manufacture our own intake kits that are seen as the leaders in their segments, often delivering the most horsepower and torque to the wheels in their class.


A frequently asked question is, what will happen to my warranty after installing a cold air intake? Your factory warranty will not be affected by installing a non-factory intake. The dealership/manufacturer has to definitively prove that the modification made to the vehicle caused the issue your vehicle is experiencing. It is important to know your rights on this: www.consumer.ftc.gov/articles/0138-auto-warranties-routine-maintenance

Next Steps:

When you’re ready to take your car or truck to the next level, give us a call at 1-866-250-5542 and our experts will be happy to help you. We offer a variety of air intake systems including Injen air intakes, K&N air intake systems, AFE intakes, AEM air intakes and STILLEN air intakes.

What are some other ways you are increasing the efficiency of your engine?