1988-1991 Honda Civic CRX Aluminum Air Intake W/Cone Filter

Fitment

This kit is listed for the 1988-1991 Honda Civic and Honda CRX. Because these cars were offered with several engines, fuel-injection systems and intake layouts, confirm your factory intake routing against the checklist below before ordering.

1988-1991 Honda Civic & CRX Cold Air Intake Kit FAQs

Q1: Is this cold air intake legal in my state?

A1: This kit does not carry a CARB Executive Order (EO) number. Not legal for sale or use in California (and other CARB-adopting states). Check your state and local emissions rules before ordering.

Q2: Will this fit my 1988-1991 Honda Civic or CRX?

A2: The kit is listed for 1988, 1989, 1990 and 1991 Honda Civic and CRX models. Because these cars were offered with different engines, fuel-injection systems and intake layouts, fitment is conditional: compare your factory intake routing, throttle-body connection and breather-hose locations with the product photos before ordering. EF Civic hatchbacks, sedans and wagons, and CRX DX, HF and Si trims, can all run different intake arrangements — verify from the existing intake assembly rather than from the model year alone, and message us if you are unsure.

Q3: Will this intake fit both DPFI and MPFI engines?

A3: Do not assume one intake configuration fits both dual-point and multi-point fuel injection. DPFI and MPFI setups use different throttle-body locations, intake tubing, vacuum connections and engine-bay routing. Compare the supplied pipe and hose locations with your original equipment before installation.

Q4: Will this intake fit a car with an engine swap?

A4: Fitment is not guaranteed on engine-swapped vehicles. A B-series, later D-series, VTEC or other swap may change the throttle-body position, intake diameter, battery location, radiator clearance and breather-hose routing. Custom couplers, brackets, tubing, or a different intake system may be required.

Q5: How much horsepower will this add?

A5: Typical intake-only gains for this application are approximately 5-10 hp and 6-8% torque. Actual results vary with the engine, fuel-injection system, exhaust setup, ignition condition, ambient temperature and testing method. On a stock D-series engine, drivers are more likely to notice stronger induction sound and slightly sharper throttle response than a dramatic horsepower increase.

Q6: Is an aftermarket intake worth it on a stock Civic or CRX?

A6: It can be worthwhile if you want a reusable dry cone filter, a lightweight aluminum intake pipe, a cleaner engine-bay appearance and a sportier induction sound. The original Honda airbox is already effective for normal street use, so view this kit as a sound, appearance and supporting airflow upgrade rather than a major standalone power modification. If you are weighing options across generations, our guide to choosing an intake for a Honda Civic walks through the trade-offs.

Q7: Does this intake require an ECU tune?

A7: A tune is not normally required for a basic intake installation on an otherwise stock, correctly running 1988-1991 Civic or CRX. Tuning may become beneficial when the intake is combined with a camshaft, header, larger throttle body, engine swap, forced induction, fuel-system changes or other major modifications.

Q8: Will it throw a check engine light, rough idle, or running-rich condition?

A8: A properly installed intake should not normally create a warning light or drivability problem. Rough idle or rich running after installation is more commonly caused by a vacuum leak, a disconnected breather hose, a damaged intake gasket, a loose clamp, incorrect hose routing, or an existing idle-control or fuel-system issue. Inspect all connections before changing ECU settings — our 7-point checklist for a rough idle after intake installation covers each cause.

Q9: Will this void my warranty?

A9: Under the Magnuson-Moss Warranty Act, an aftermarket part cannot void your factory warranty unless it is proven to have caused the failure. This kit is designed as a direct bolt-on replacement that keeps the factory sensors and connections.

Q10: Will the cone-filter intake make my Civic or CRX louder?

A10: Yes. Replacing the enclosed factory airbox with an aluminum pipe and cone filter makes the engine's induction sound more noticeable. Expect a deeper intake tone under acceleration and a sharper sound near wide-open throttle, while light cruising remains comparatively quiet. If you want the loudest possible setup, the open-element (short ram) style is the louder choice.

Q11: Can this intake improve throttle response and gas mileage?

A11: The smoother intake path may make throttle response feel more immediate, particularly if your original filter or intake tube is dirty or damaged. MPG is dominated by driving habits — engine condition, tire pressure, gearing, driving speed, fuel delivery and throttle habits have a far greater effect than the intake — so a measurable fuel-economy gain is not guaranteed. Expect the main benefit as throttle response and intake tone rather than fuel economy.

Q12: How do I clean and maintain the cone filter?

A12: The included filter is a dry element — it does not require oil. Remove it, wash it with soap and water, rinse until clean, let it dry completely, and reinstall. Check the filter approximately every 5,000 miles to see if it needs washing, and inspect it more often in dusty driving or after heavy rain.

Q13: Is this a true cold air intake or a short ram intake?

A13: The kit uses an aluminum intake pipe with a cone filter, and whether it functions as a cold air or short ram setup depends on the final filter position in the specific vehicle. A filter located inside the engine bay behaves more like a short ram intake, while a filter routed toward a cooler fender area can draw lower-temperature outside air. Plan your routing before installation if cooler charge air is the priority.

Q14: Is there a risk of water entering the engine?

A14: Water-ingestion risk depends on where the filter is mounted. A filter positioned low near the bumper or inner fender is more exposed to deep standing water than one located high in the engine bay. Avoid flooded roads, keep the factory splash shields installed, and inspect the filter after heavy rain or water exposure. Water ingestion can cause hydrolock and severe engine damage.

Q15: What's included, and how long does installation take?

A15: The package includes one aluminum intake pipe kit, one reusable dry cone air filter, and the supplied couplers, clamps, hose and mounting hardware — check all components against the product photos before removing the factory airbox. Installation takes under 60 minutes with common hand tools, though rusted hardware, previous modifications or a swapped engine can extend the job. Before starting the car, confirm every clamp is tight and that the pipe does not contact the throttle linkage, battery terminals, cooling fan, belts or hot exhaust components.