Cold Air Intake For 2012–2015 Honda Civic Si 2.4L GAS DOHC

Fitment:

2012-2015 Honda Civic Si K24Z7 2.4L

Features:

• Huge sound improvement
• Quick and Easy Install
  
• Retains the Lower Factory Cold air intake box
• Improves Throttle Response
• Cleanable and reusable filters
• Up to 15HP increase
• Powder-coated black finish
• Lifetime warranty on defects and fitment
• 90-day return period
• All orders ship in 1-2 business days

Unleash the high-revving potential of your Civic Si with a precision-engineered Cold Air Intake System explicitly designed for the 2012–2015 2.4L DOHC i-VTEC engine. This system is built to dramatically improve airflow, throttle response, and overall engine performance—while adding that aggressive intake growl every enthusiast craves.

Unlike stock airboxes that draw in warmer air from inside the engine bay, this cold-air intake relocates the filter to a cooler location in the fender well. Delivering colder, denser air to the engine increases the oxygen available for combustion. The result is a more powerful explosion in the cylinder, translating into increased horsepower and torque—especially in the high-RPM range where the K24 engine comes alive.

But this intake doesn’t stop at just cooler air. Its inlet pipe is carefully tuned in length and diameter to optimize the resonance and air velocity for the Civic Si’s naturally aspirated setup. This "air tuning" helps the engine breathe more efficiently throughout the RPM band, maximizing power gains without sacrificing drivability or low-end torque.

2012–2015 Honda Civic Si Cold Air Intake FAQ

Q1: Does this cold air intake fit every 2012–2015 Honda Civic?

A1: No. This cold air intake is specifically designed for the 2012–2015 Honda Civic Si equipped with the naturally aspirated 2.4L K24Z7 engine. It is not intended for standard Civic LX, EX, HF, Hybrid, or other non-Si models because their engines, intake routing, sensors, and mounting points are different. Confirm that your vehicle is a Civic Si with the K24Z7 engine before ordering.

Q2: Will this intake fit both the Civic Si coupe and sedan?

A2: It is designed around the 2012–2015 Honda Civic Si 2.4L K24Z7 platform. However, because intake routing and surrounding components can vary by model year and body configuration, verify your original intake layout and available mounting points before installation. Contact Flashark with your year, body style, and engine information if you are unsure about fitment.

Q3: Is this intake compatible with the K24Z7 engine?

A3: Yes. This is a K24Z7 cold air intake made for the 2.4L DOHC i-VTEC engine used in the ninth-generation 2012–2015 Honda Civic Si. It should not be selected based only on engine displacement, since other Honda and Acura 2.4L engines may use different throttle bodies, sensor locations, brackets, and intake routing.

Q4: Does this intake fit a K24A or K24A7 engine swap?

A4: Direct fitment is only listed for the factory K24Z7 engine in the 2012–2015 Civic Si. A K24A-series swap may use a different intake manifold, throttle body position, sensor arrangement, or engine-bay layout. Custom piping, couplers, brackets, wiring changes, or tuning may be required, so this kit should not be treated as a guaranteed bolt-on solution for an engine-swapped vehicle.

Q5: How much horsepower can a 2012–2015 Civic Si cold air intake add?

A5: Flashark lists a potential increase of up to 15 horsepower. Actual results depend on the condition of the engine, ambient temperature, fuel quality, ECU calibration, exhaust modifications, installation quality, and dyno testing method. On an otherwise stock Civic Si, the most noticeable everyday changes are usually a stronger intake sound and sharper throttle response rather than a dramatic increase in peak power.

Q6: Do I need a tune after installing this K24Z7 cold air intake?

A6: A tune is not always required for a properly installed street intake that keeps airflow readings within the ECU’s expected range. However, tuning can help optimize fueling, ignition timing, throttle response, and power when the intake is combined with a header, exhaust, intake manifold, or other airflow modifications. If the engine develops a check engine light, unstable idle, hesitation, or abnormal fuel trims, inspect the installation and consult a qualified Honda tuner.

Q7: Will this intake cause a check engine light?

A7: A correctly installed intake should not automatically cause a check engine light. Common causes after installation include a loose hose clamp, disconnected breather hose, damaged sensor wiring, an air leak after the airflow measurement point, or an incorrectly positioned sensor. Recheck every connection before assuming the intake itself is defective, and scan the ECU for diagnostic trouble codes if the warning light remains on.

Q8: What will this intake sound like on a ninth-generation Civic Si?

A8: Expect a deeper induction tone during acceleration and a more aggressive growl as the K24Z7 climbs through the RPM range. The change is most noticeable under moderate to wide-open throttle, while normal cruising should remain considerably quieter. The intake does not replace the exhaust system, so it primarily changes the sound coming from the front of the car rather than the exhaust note at the rear.

Q9: Will this intake improve throttle response?

A9: It is designed to reduce intake restriction and improve airflow compared with the factory system, which can make the engine feel more responsive when the throttle is opened. The difference may be most noticeable during passing, downshifts, and higher-RPM acceleration. Results vary with engine condition, ECU adaptation, outside temperature, and any additional performance modifications.

Q10: Does this kit remove the entire factory air intake system?

A10: No. The product is designed to retain the lower factory cold air intake box while replacing key parts of the restrictive original intake path. Reusing the correct factory components helps preserve proper routing and supports a cleaner installation. Do not discard the original intake until the new system has been fully installed, inspected, and test-driven.

Q11: Is a cold air intake better than a short ram intake for a 2015 Civic Si?

A11: A cold air intake is intended to draw air from a cooler area away from concentrated engine-bay heat, while a short ram intake places the filter closer to the engine for a shorter airflow path and louder induction sound. A cold air design may provide more consistent intake temperatures during warm-weather driving, whereas a short ram can be easier to access. The better choice depends on climate, driving conditions, sound preference, installation layout, and tuning plans.

Q12: Can this cold air intake cause hydrolock in heavy rain?

A12: Any low-mounted intake filter can face water-ingestion risk if the vehicle is driven through deep standing water or flooded roads. Normal rain and wet pavement are not the same as submerging the filter, but drivers should avoid deep water and make sure splash shields and inner fender liners remain properly installed. If the filter becomes soaked, do not continue driving until the intake has been inspected and dried.

Q13: How difficult is it to install this Civic Si intake?

A13: Installation is generally suitable for an experienced DIY owner with basic hand tools, although access around the factory airbox, hoses, clamps, sensors, and lower intake area may require patience. Allow the engine to cool, disconnect the negative battery terminal, and photograph the original hose and sensor routing before disassembly. After installation, confirm that the pipe does not contact the body, wiring, radiator hoses, or moving components.

Q14: How often should the reusable air filter be cleaned?

A14: Inspect the filter during routine oil changes and clean it whenever dirt buildup begins restricting the filter surface. Vehicles driven on dusty roads, near construction areas, or in heavy traffic may require more frequent service. Use a cleaning method appropriate for the supplied filter material, allow it to dry completely, and never reinstall a wet or over-oiled filter.

Q15: Will installing this intake affect emissions compliance or the vehicle warranty?

A15: Regulations and warranty decisions vary by location and vehicle condition. An intake modification may be subject to local inspection or emissions requirements, so confirm the rules in your state or region before installation. Vehicle manufacturers generally evaluate warranty claims according to whether an aftermarket component contributed to the reported failure, so retain the factory intake and all original hardware in case the vehicle needs to be returned to stock.