If you're looking to boost your 1.5L Turbo Civic's performance, let me tell you about the Cobra Cold Air Intake System. It's hands-down my top pick for this platform. But if you're not keen on going the cold air route, the Short Ram Intake System is a solid alternative that won't let you down.

One of the standout features of this intake is the CNC machined billet aluminum MAF housing. It’s designed to keep your fuel trims right where they should be—within 4% of factory short-term and long-term fuel trims. This means you can enjoy a smooth driving experience without any hiccups. The system comes equipped with a 4-inch air filter, which is crucial for letting your engine breathe better.

Now, you’ve got two options for MAF housing: the Standard Bore and the Big Bore. Both work with your factory MAF sensor, but they differ in diameter and performance. The Standard Bore is great if you want to keep things simple; it provides factory-spec fuel trims without needing any tuning. On the flip side, the Big Bore allows for a whopping 50% more air flow compared to the Standard. That’s where the fun begins, but it does require a tune to really unleash its potential. This increased airflow means less pumping loss and a more direct path for cooler air to reach your engine.

What’s really neat is that you don’t have to commit to just one MAF housing. With our MAF Housing Conversion Kit, you can easily switch between them without needing a whole new intake system. Plus, if you decide to go for the Cold Air Intake later, we have a conversion kit for that too.

• With the Standard Bore MAF housing, you can expect around 15 horsepower and 12 ft/lb of torque over stock—no tune needed.
• Step it up with the Big Bore MAF housing, and you could see gains of about 20 horsepower and 15 ft/lb of torque, especially with a basemap calibration on Hondata or KTuner.
• And if you’re really pushing your Civic’s limits with custom tuning, even bigger gains are on the table.

• Designed for the Honda Civic Si 1.5L Turbo from 2017 to 2021.

• This intake fits most variants, including the 6MT, CVT, RHD, and even international models.
• Keep in mind, short ram intakes can be sensitive to heat-soak on this chassis, which is why I usually lean towards the CAI for better performance.
• No ECU calibration is needed for the Standard Bore MAF Housing, which is a nice bonus.
• Compatible with Two Step Performance TSP & Phearable Calibrations if you select the Race MAF option.

In short, if you want to give your 2017-2021 Honda Civic a performance boost, the PRL Motorsports Standard Bore MAF Housing Short Ram Air Intake System is worth checking out. It’s a well-thought-out piece of engineering that delivers real results.