For the 2016 model year Honda has introduced a new engine for the Civic: a 1.5 L turbocharged four cylinder. Despite its diminutive displacement, the 1.5 L produces 174 horsepower at a relatively leisurely 5500 rpm with a torque curve thats flat from 1800 5500 rpm. Despite this high level of performance, theres actually room for improvement.

Just looking at the air intake Honda installed at the factory, it was clear to AEM engineers they could do better, much better. So AEM developed a cold air intake for this new engine that replaces the birdhouse-sized air box with just a bird-sized hole for an inlet. In doing so, the 21-798C AEM cold air intake installed on an otherwise stock 2016 Honda Civic raised output by 10 horsepower at the wheels. For reference, the stock Civic recorded 148 horsepower at the front wheels, so with the addition of the AEM cold air intake its close to gaining an estimated 17 horsepower at the flywheel.

A cold air intake system relocates the filter to an area of the engine compartment where its best able to draw cool outside air. Cooler air carries additional oxygen, which translates into a more intense explosion in the combustion chamber which creates incremental horsepower and torque. And with a turbocharger packing air in even tighter, it makes that much more power.

But that’s only part of the power equation. Tuning the inlet pipe in length and diameter to match the engine’s resonance helps move more air to the turbocharger. During development, fuel trim monitor correction factors and all OBD II sensors are tested to eliminate leaning out the engine or activating a check engine light.

The AEM 21-798C cold air intake is a relatively inexpensive DIY modification that takes only a couple of hours to install with tools just about everyone has in their garage. It comes with the necessary clamps and hardware for an OEM-type appearance. OEM mounting brackets and hardware are utilized for seamless installation.

The AEM air filter is good for 100,000 miles before requiring service (depending upon your driving conditions) so if you drive in dusty conditions, your filter may require more frequent maintenance. Cleaning consists of an application of AEM synthetic air filter cleaner which will loosen and dissolve grime and dirt build up, after which the filter can simply be rinsed with water, dried, and reinstalled. No messy oiling required. AEM warrants that its intake systems will last for the life of your vehicle.

Estimated horsepower gain: 10 HP @ 3800 RPM

Street Legal In All US States: for 2016 Model D-670-24. Except LEV3 SULEV30 Test Group GHNXV01.56K2

• Increased horsepower
• Tuned and dyno-tested to improve acceleration and engine sound
• Low restriction aluminum tubing
• Air filter lasts up to 100,000 miles before cleaning is required (depending on driving conditions)
• Washable and reusable oil-free filter media
• AEM Lifetime Limited Warranty