Understanding an AEM Electronically Tuned Intake (ETI)

An AEM ETI module is like an electronic mediator, keeping both the MAF sensor and ECU happy allowing AEM to take full advantage of larger air intake tubes and improved performance
An AEM ETI module is like an electronic mediator, keeping both the MAF sensor and ECU happy allowing AEM to take full advantage of larger air intake tubes and improved performance

An air intake system is designed to increase power by reducing air intake restriction and turbulence. It’s pretty common to find that an aftermarket air intake system uses larger diameter air intake tubes than what comes from the factory. This is very effective at reducing restriction in the air path, but when a larger diameter intake is used on modern cars equipped with a mass airflow (MAF) sensor, it can create confusion for the engine control unit (ECU). This confusion will often lead to a check engine light and/or drivability issues.

When it comes to installation the AEM electronically tuned intake module is a simple plug and play solution using factory connections and does not require any cutting or splicing
When it comes to installation the AEM electronically tuned intake module is a simple plug and play solution using factory connections and does not require any cutting or splicing

Larger diameter tubing is capable of delivering a greater volume of air, but at the same time this can confuse a vehicle’s ECU due to improper MAF sensor readings. Without getting too technical, based on Bernoulli's principle, airspeed will decrease as the size of air intake tubes increase. Slower air speed will cause the mass airflow sensor to send inaccurate readings to the engine control unit. The ECU will then attempt to compensate by adjusting the amount of fuel injected into the cylinders.

Installing and using an AEM ETI is simple, yet AEM uses advanced technology on the inside of the electronically controlled intake module for increased performance
Installing and using an AEM ETI is simple, yet AEM uses advanced technology on the inside of the electronically controlled intake module for increased performance

Before the AEM electronically tuned intake, a properly designed short ram intake, or cold air intake, would use mechanical methods of increasing air speed, such as reducing the tube diameter, as it passes through the MAF sensor. While this is effective at preventing check engine lights, it has two negative side effects. First, this usually causes a point of restriction in the air intake tube, and second it creates turbulence in the airflow. Reducing restriction and turbulence are supposed to be the two goals of an aftermarket air intake system.

With an AEM Electronically Controlled Intake (ETI), there is no need to detune an air intake system. The ETI module included with every AEM ETI air intake is designed to communicate with the mass airflow sensor and the ECU. Think of an AEM ETI module as a mediator, keeping both the MAF sensor and ECU happy. This allows AEM to take full advantage of larger air intake tubes and improving performance without the hassle of aftermarket tuning or the risk of drivability issues.

Not every car or truck needs the aid of an AEM Electronically Tuned Intake module for enhanced performance. Use the Search by Car or Truck tool to find an AEM air intake system for your vehicle and see if an AEM ETI air intake is available.


Traditionally an air intake system would need to be detuned, often by reducing the air intake tubes diameter, to prevent a check engine light and/or drivability issues
Traditionally an air intake system would need to be detuned, often by reducing the air intake tubes diameter, to prevent a check engine light and/or drivability issues
With an AEM Electronically Controlled Intake, there is no need to detune an air intake system as the AEM ETI module will help the MAF sensor interpret correct air speed readings
With an AEM Electronically Controlled Intake, there is no need to detune an air intake system as the AEM ETI module will help the MAF sensor interpret correct air speed readings