Product Details
Fitment
FAQ
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2012-2015 Honda Civic Si 2.4L Cold Air Intake Kit
The Flashark cold air intake kit for the 2012-2015 Honda Civic Si 2.4L replaces the factory intake assembly with a smooth black-coated aluminum tube and a washable, reusable red cone filter, letting the 2.4L four-cylinder pull in more and colder air. The payoff shows up where you can feel it: sharper throttle response, an expected 5-10% horsepower and 6-8% torque improvement, and a deeper, more aggressive induction note under acceleration. Installation is a direct bolt-on swap that most owners finish in under 60 minutes with common hand tools.
Specifications
| Brand | Flashark |
| Type | Cold Air Intake |
| Style | Cold Air Intake |
| Color | Black Coated Aluminum Pipe, Red Filter |
| Material | Aluminum Piping |
| Filter | Washable and Reusable |
| Package | 1 x Performance Cold Air Intake Kit |
Key Features
- High-Strength Aluminum Construction: The lightweight aluminum tubing is built for strength and durability, with a high-flow racing-performance-spec design that keeps intake air moving with fewer restrictions than the factory setup.
- More Cold Air, Sharper Response: Helping the engine draw in more and colder air translates into quicker throttle response and higher explosive horsepower output when you get on the gas.
- Up to 95% Filtration Efficiency: The red filter media delivers up to 95% filtration efficiency, so the cleaner airflow does not come at the cost of engine protection.
- Washable, Reusable Filter: The cone filter rinses clean and goes back on the tube instead of turning into a recurring replacement expense.
- Expected Power Gains: Approximately 5-10% horsepower and 6-8% torque improvement, along with improved gas mileage, with actual results depending on vehicle condition, ECU calibration, and supporting hardware.
- Sporty, Aggressive Sound: The intake adds a sporty, aggressive engine note for an enhanced driving experience, especially under hard acceleration.
- Under-60-Minute Install: This intake kit can be set up in under 60 minutes using common hand tools.
Who This Kit Is For
This Flashark cold air intake kit is built for 2012, 2013, 2014, and 2015 Honda Civic Si models with the 2.4L four-cylinder engine, and it also covers 2013-2015 Acura ILX 2.4L applications.
- For you if you want a sharper throttle response and a louder, more aggressive intake note from your Civic Si.
- For you if you prefer a washable, reusable filter over buying disposable filter cartridges.
- For you if you want a first bolt-on upgrade you can finish in under an hour with hand tools.
- For you if you drive a 2013-2015 Acura ILX 2.4L and want the same intake upgrade. Browse the full Honda Civic Cold Air Intake Kits range to compare related options.
This kit is not for you if your Civic is an LX, EX, DX, or HF with the 1.8L engine, or your ILX has the 2.0L engine or a hybrid powertrain, since those use different intake routing and mounting points. For a 1.8L 2012-2015 Civic, use the dedicated Cold Air Intake Kit for 2012-2015 Honda Civic DX/EX/LX/Touring/SE instead. This kit is also not for you if you need a CARB-legal part for street use in California or another CARB-adopting state, or if you expect a guaranteed MPG gain.
Check Before Ordering
- Vehicle fitment: This kit is made for the 2012-2015 Honda Civic Si 2.4L and the 2013-2015 Acura ILX 2.4L. Confirm the engine size and original intake layout before ordering, especially if the vehicle has been engine-swapped or previously modified.
- Intake system: The kit replaces the factory intake assembly with a black-coated aluminum intake pipe and a reusable performance filter. Verify that your car still uses the factory-style throttle-body position, sensor arrangement, and engine-bay layout before installation.
- Filter care: The cone filter is washable and reusable. Inspect it during regular maintenance and clean it whenever it looks dirty rather than on a fixed calendar schedule.
- Sensors and connections: Confirm the condition and routing of your factory sensor wiring and breather hoses before removing the stock intake. An air-flow-related code after installation usually traces back to a loose coupler, vacuum leak, or disconnected hose rather than the kit itself.
- Legality: This kit does not carry a CARB Executive Order number and is not legal for sale or use in California (and other CARB-adopting states). Check your state and local emissions rules before ordering.
- Installation and water: Budget under 60 minutes with common hand tools. Before starting the engine, confirm all clamps are tight and every hose and sensor is connected, and avoid deep standing water crossings at all times (hydrolock risk).
Shipping & Returns
Free U.S. Shipping: Orders are typically processed within 1-2 business days and delivered within 7-9 business days. Additional charges may apply to remote areas.
30-Day Returns: Unopened and unused items in their original packaging may be returned within 30 days of receipt. Return shipping is covered for verified quality issues.
Worry-Free Delivery: Optional protection against eligible loss, theft, delay, or transit damage is available at checkout.
Fitment
| Year | Model | Engine |
| 2015 | Acura ILX | 2.4L L4 |
| 2015 | Honda Civic Si | 2.4L L4 |
| 2014 | Acura ILX | 2.4L L4 |
| 2014 | Honda Civic Si | 2.4L L4 |
| 2013 | Acura ILX | 2.4L L4 |
| 2013 | Honda Civic Si | 2.4L L4 |
| 2012 | Honda Civic Si | 2.4L L4 |
2012-2015 Honda Civic Si 2.4L Cold Air Intake FAQs
Q1: What vehicles does this cold air intake kit fit?
A1: This Flashark cold air intake kit is designed for 2012, 2013, 2014, and 2015 Honda Civic models equipped with the 2.4L four-cylinder engine. The fitment table above also includes 2013-2015 Acura ILX 2.4L applications. Confirm the engine size and original intake layout before ordering, especially if the vehicle has been engine-swapped or previously modified.
Q2: Does this intake fit a 2013 Honda Civic Si?
A2: Yes. A 2013 Honda Civic Si equipped with the factory 2.4L engine is included in the fitment table. The kit replaces the factory intake assembly with a black-coated aluminum intake pipe and a reusable performance filter.
Q3: Will this cold air intake fit a 2015 Honda Civic Si?
A3: Yes. The 2015 Honda Civic 2.4L is included as a compatible application in the fitment table. Verify that the car still uses the factory-style throttle-body position, sensor arrangement, and engine-bay layout before installation.
Q4: Does this intake fit the 2012-2015 Civic LX, EX, or HF with the 1.8L engine?
A4: No. This intake is designed for the 2.4L Civic Si engine and is not intended for Civic LX, EX, DX, or HF models equipped with the 1.8L engine. The 1.8L and 2.4L engines use different intake routing, pipe dimensions, mounting points, and sensor locations.
Q5: Will this intake fit a 2013-2015 Acura ILX 2.4L?
A5: Yes. The fitment table includes 2013, 2014, and 2015 Acura ILX models equipped with the 2.4L four-cylinder engine. It is not intended for ILX models with the 2.0L engine or hybrid powertrain, which use different intake systems.
Q6: Is this intake designed for the K24Z7 engine?
A6: The 2012-2015 Civic Si commonly uses the 2.4L K24Z7 engine, and this kit is designed for the factory 2.4L Civic Si application. Because older cars may have replacement engines or modified intake manifolds, confirm the engine code and throttle-body layout before purchasing.
Q7: What is included with the Flashark Civic Si cold air intake?
A7: The package includes one performance cold air intake kit with a black-coated aluminum pipe and a washable, reusable red air filter. Check the product images and supplied hardware before removing the factory airbox to confirm that all couplers, clamps, hoses, and mounting pieces are present.
Q8: Does a 2012-2015 Civic Si cold air intake require a tune?
A8: The engine may run with a correctly installed intake on the factory calibration, but a tune is often recommended when airflow characteristics or intake-pipe diameter differ significantly from stock. Hondata FlashPro or another suitable tuning solution can help correct fuel trims, optimize throttle response, and make better use of the intake, especially when combined with a header, exhaust, or other performance parts.
Q9: Can I install the intake without Hondata FlashPro?
A9: Physical installation does not require FlashPro, but drivability and performance depend on how closely the intake preserves the factory airflow readings. After installation, monitor idle quality, fuel trims, throttle response, and warning lights. If the engine runs lean, hesitates, or stores airflow-related codes, return to the stock intake until the setup can be inspected and properly calibrated.
Q10: How much horsepower can a cold air intake add to a 9th Gen Civic Si?
A10: Expected intake-only gains for this application are approximately 5-10% horsepower and 6-8% torque, but actual results depend on the intake design, ECU calibration, engine condition, temperature, fuel quality, and supporting modifications. On an otherwise stock Civic Si, the most noticeable changes may be a stronger induction sound and improved high-RPM response rather than a large peak-power gain.
Q11: Will this intake make my Civic Si louder?
A11: Yes. Replacing the sound-insulated factory airbox with an aluminum intake pipe and performance filter makes induction noise more noticeable. Expect a deeper growl during acceleration, a louder rush of air near wide-open throttle, and a more aggressive VTEC crossover sound at higher RPM.
Q12: Will the intake cause a check engine light or rough idle?
A12: A correctly installed and properly calibrated intake should not normally cause a persistent check engine light. Common causes after installation include a loose coupler, vacuum leak, disconnected breather hose, damaged sensor wiring, incorrect sensor placement, or airflow readings outside the factory ECU's expected range. Scan the diagnostic code and inspect the complete installation before replacing parts. Still troubleshooting? See our guide on rough idle after cold air intake installation for a 7-point fix checklist.
Q13: Is a cold air intake better than a short ram intake for the Civic Si?
A13: A cold air intake places the filter farther from engine heat and may provide lower intake temperatures while the car is moving. A short ram intake usually offers easier installation, simpler filter access, and less water-exposure risk, but it may draw warmer engine-bay air at low speeds. The better choice depends on climate, driving conditions, desired sound, and tuning plans. For the full breakdown, read our Short Ram vs Cold Air Intake Civic comparison.
Q14: Can this cold air intake cause hydrolock in heavy rain?
A14: Hydrolock is possible if a low-mounted filter becomes submerged and draws a large volume of water into the engine. Normal rain usually does not cause this when the intake, fender liner, and splash shields are correctly installed, but deep standing water should always be avoided. A filter cover may reduce splash exposure, but it cannot make driving through deep water safe.
Q15: How long does installation take, and what should I check afterward?
A15: Installation can typically be completed in under 60 minutes with common hand tools. Before starting the engine, confirm that all clamps are tight, every hose and sensor is connected, the filter is secure, and the pipe does not contact the battery, radiator fan, belts, bodywork, or hot engine components. After the first drive, recheck the clamps and inspect for rubbing or air leaks. If you want to compare more options first, the Honda Cold Air Intake Kits collection lists the wider Flashark line-up.
Fast Shipping Policy
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Easy Return Policy
Every order comes with a 30-day free return, provided the item is brand new, uninstalled, and in its original packaging. We cover return shipping for quality issues. Refunds are processed within 3-5 business days. Click for Return Policy
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