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Clean Up the Air Before the Sensor Reads It
This is AEM part number 9-21070, an air straightener insert that conditions turbulent intake air before it reaches the mass air flow sensor so the sensor can produce a steadier signal. It is a universal intake accessory and is not a filter.
Key Features
- Insert that straightens incoming air before it reaches the mass air flow sensor
- Helps the sensor read a more consistent airflow signal
- Molded plastic construction with an open mesh that does not restrict flow like a filter
- Fits into an intake tube or mass air flow sensor housing
- Universal accessory rather than a vehicle specific part
Fitment
| Fitment | Application | Notes |
|---|---|---|
| Universal fit | Intake tubes and mass air flow sensor housings that accept the straightener insert | Confirm the internal diameter of your intake tube before ordering |
This is a universal intake accessory rather than a vehicle specific part, so fitment depends on the internal diameter of the tube or housing it is fitted into.
This listing is AEM part number 9-21070. Confirm the internal diameter of your intake tube or mass air flow housing against the part before ordering.
Manufacturer published detail for this part number is limited to the item description held in this catalog, so no additional dimensional claims are made here.
Specifications
| Detail | Value |
|---|---|
| Product line | AEM intake accessory |
| Item | Air straightener insert |
| Material | Molded plastic |
| Fit type | Universal |
| Manufacturer part number | 9-21070 |
| Brand | AEM |
| Condition | New |
What's Included
- One AEM air straightener insert
About AEM
AEM Performance Electronics builds engine management, fuel delivery and air intake hardware for the performance aftermarket, with a catalog that spans standalone ECUs, wideband controllers, high flow fuel pumps and intake accessories.
FAQ
What is 9-21070?9-21070 is the AEM part number for this air straightener. Ordering by that number is the only way to be certain you are getting this exact item, because listings that only describe the product can cover several different part numbers.
What does an air straightener actually do?It smooths turbulent air before it reaches the mass air flow sensor, which helps the sensor produce a steadier reading and therefore a more consistent fuel calculation.
Is this a filter?No. It does not filter dirt out of the intake charge and it does not replace an air filter. It only conditions the airflow ahead of the sensor.
Will it fit my intake?Fitment depends on the internal diameter of your intake tube or sensor housing. Send us your intake details with part number 9-21070 and we will check before shipping.
Do I need a tune after fitting it?No tune is required to install it, but if your car is tuned around an existing airflow reading, any change to the intake path is worth verifying with your tuner.
Is this the genuine AEM part or a copy?This is genuine AEM product sold new in the manufacturer packaging under part number 9-21070. It is not a reproduction or a superseded number.
Does this part come with a warranty?Warranty is handled under the AEM consumer warranty that applies to part number 9-21070 at the time of purchase. Keep your order confirmation, because warranty claims are processed against the original purchase record.
Will you confirm fitment before it ships?Send us the year, make, model, engine and drivetrain of the vehicle along with part number 9-21070 and we will check the application against the manufacturer data before the order goes out.
How quickly does this ship?Orders normally leave the warehouse within one to three business days once the order is verified. If part number 9-21070 is on factory backorder we will tell you before charging the order.
Installation Instructions
- Measure the internal diameter of the intake tube or mass air flow housing where the straightener will sit and confirm the part matches.
- Remove the intake tube section or air box lid needed to reach the mass air flow sensor.
- Clean the inside of the tube so nothing is left to be drawn into the engine.
- Fit the straightener into the tube ahead of the sensor, with the mesh square to the airflow.
- Confirm the straightener is fully seated and cannot move or rotate in the tube.
- Reassemble the intake, checking every clamp and connection for a proper seal.
- Start the engine and confirm there are no intake leaks and no new fault codes.
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