The Subaru Impreza is powered by the FB20B 2.0 L horizontally-opposed four cylinder engine. The engine features double overhead camshafts and muscle car-like 10.5:1 compression ratio. The FB20B produces 148 horsepower at 6200 rpm and 145 lb-ft of torque at 4500 rpm, however, there is room for improvement. Virtually the same engine (displacement, bore, stroke, compression ratio, etc.) as installed in the Subaru XV Hybrid produces 160 horsepower.
Noting the opportunity, AEM engineers developed the 21-772C cold air intake which they tuned and dyno-tested to improve acceleration and add a nice raspy engine sound. Installation is a relatively inexpensive process, adding an estimated 10 horsepower and nearly 10 ft-lb of torque to your Subaru Impreza as shown on the AEM dynamometer. The performance increases can be achieved via a DIY installation that takes around an hour with tools just about everyone should have in their garage.
The results of AEM chassis dyno testing are that a stock Impreza 2.0L generated 116 horsepower and 111 ft-lb of torque. With the AEM 21-772C bolted to the test vehicle, horsepower jumped to 125 and torque increased to 117 ft-lb.
This noticeable improvement in power can be felt in everyday driving, whether it's accelerating away from a traffic light, margining onto a highway on ramp, or cruising along some steep roads. The key to AEM air intake systems is the non-woven synthetic filter media, a modern solution for controlling the quality of air that passes through it. The seven-inch AEM conical filter helps protect your engine from harmful road grit, and it's mounted right at the front of the car where it can take full advantage of the cool incoming air, protected by a shield to keep underhood heat out of the intake air.
Estimated Horsepower Gain 10 HP @ 5800 RPM
Note: Street Legal In All US States: No
- Increases Power & Torque
- Relocates Air Filter Outside Engine Compartment
- Guaranteed for the life of your car or truck
- Comes with a lifetime DRYFLOW Synthetic air filter with great filtration