AEM 21-687C Cold Air Intake System

Why Upgrade Your Sentra SE-R with the AEM 21-687C?

Because the factory intake kills half the fun.

The 21-687C gives you:

• Much better airflow compared to OEM

• Improved throttle response

• Stronger mid-range performance

• A deep, aggressive intake tone—especially in the Spec V

• Washable AEM Dryflow filter (oil-free = no MAF drama)

• Powder-coated mandrel-bent aluminum tube for durability & airflow

• True cold-air placement for cooler, denser air

For a high-revving QR25DE, this upgrade makes a major difference in how the car feels and sounds.

AEM Air Intake Systems are designed to produce massive horsepower and torque gains as well as better engine sound when used as a replacement for the factory airbox and air filter. AEM intake systems are designed, tuned, and dyno-tested to fit specific cars and trucks.

Key Features of the AEM 21-687C Cold Air Intake

🌀 Mandrel-Bent Aluminum Tube

Designed for smooth airflow and correct MAF scaling—no CEL nightmares.

🧼 AEM Dryflow Filter

• Reusable

• Oil-free

• High filtration

• Excellent flow for the QR25’s needs

These air intakes usually include an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration, and performance while allowing easy oil-free cleaning.

❄ Cold-Air Intake Routing

Positions the filter low in the bumper area to minimize heat-soak.

🔧 Direct Fitment

Bolts to factory mounting points, includes all hardware, no cutting required.

🎧 Enhanced Engine Note

Finally lets your QR25DE sound like a performance engine instead of a congested one.

Most AEM intake systems use mandrel-bent aluminum intake tubes, powder coated heat shields, and high quality hardware designed to reduce restriction and reduce intake temperature.

What Gains Can SE-R Owners Expect?

Typical improvements for the QR25DE include:

• Faster throttle response

• More eager mid-range pull

• Better breathing at higher RPM

• Noticeably improved induction sound

• Supports future mods like exhausts and tuning

Spec V owners in particular notice snappier acceleration and more intake growl.

The design and components of each intake system vary so consult the installation instructions for more information on the contents of each part number.

Daily-Driver Friendly

• No tune required

• Works with stock ECU

• Dryflow filter = easy maintenance

• Does not interfere with emissions components

• Improves sound without adding highway drone or annoyance

Perfect for daily use or spirited weekend driving.

AEM manufactures a variety of intake kit styles including short ram intakes, cold air intakes, dual-chamber intakes, Brute Force intakes for trucks and SUV’s, and Brute Force HD intakes for diesel applications.