• Cold Air Intake for Honda Civic SI (1999-2000) 1.6L L4 Engine

Cold Air Intake for Honda Civic SI (1999-2000) 1.6L L4 Engine

$89.99
$89.99
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Cold Air Intake System for Honda Civic Si 1.6L (1999–2000) – High-Flow Performance Intake Upgrade

This cold air intake system is engineered specifically for 1999–2000 Honda Civic Si models equipped with the 1.6L 4-cylinder engine. Designed to replace the restrictive factory air box and intake tubing, this system increases airflow efficiency, improves throttle response, and enhances overall engine performance.

By delivering cooler, denser air directly to the engine, the intake supports improved combustion efficiency and quicker engine response. The result is stronger acceleration, improved mid-range power, and a deeper, sportier intake sound under throttle.

Vehicle Fitment

  • 1999–2000 Honda Civic Si
  • 1.6L Inline-4 Engine
  • Manual transmission equipped models
  • Designed for factory manifold and engine management systems

Performance & Engineering

High-Flow Air Intake Design: This intake system replaces the factory air box and intake tube with smooth, mandrel-bent aluminum piping to reduce airflow restriction and turbulence. Improved airflow allows the engine to breathe more efficiently across the RPM range.

Power Gains: Under optimal conditions, this cold air intake can deliver gains of up to 10% in horsepower and torque. Actual results may vary depending on vehicle condition, altitude, ambient temperature, and supporting modifications.

Throttle Response: Reduced intake restriction results in faster throttle response and improved acceleration during both city and highway driving.

Construction & Materials

T304 Aluminum Intake Tubing: The intake pipe is constructed from lightweight T304 aluminum for excellent corrosion resistance, durability, and improved heat dissipation. Mandrel bending ensures a consistent internal diameter to maintain airflow velocity.

High-Flow Performance Filter: The included open-element air filter is designed for high airflow while maintaining effective filtration. Its washable and reusable design reduces long-term maintenance costs compared to disposable paper filters.

Features & Benefits

  • Boosts horsepower and torque by up to 10%
  • Improves throttle response and acceleration
  • Mandrel-bent T304 lightweight aluminum piping
  • Engineered for high airflow and effective filtration
  • Replaces factory air filter and intake tube
  • Maximizes airflow through the stock intake manifold
  • Produces a deeper, sportier intake sound
  • Washable and reusable high-flow air filter
  • Does not void factory vehicle warranty when properly installed

What’s Included

  • T304 aluminum intake pipe
  • High-flow washable performance air filter
  • Silicone couplers
  • Clamps and mounting hardware

Installation

  • Direct bolt-on installation
  • No cutting or drilling required
  • Uses factory mounting locations
  • Estimated installation time: under 60 minutes
  • Basic hand tools recommended

Installation Note: After installation, disconnect the negative battery terminal for at least 60 seconds to allow the ECU to reset and adapt to the increased airflow. Always disconnect the battery and ensure the engine is completely cool before performing installation.

Filter Maintenance

Inspection Schedule: Inspect the air filter every 5,000 miles and clean if necessary. Driving conditions such as dusty environments, urban traffic, or aggressive driving may require more frequent inspection and servicing.

Cleaning Procedure: Remove the filter from the intake tube and gently tap it to dislodge loose debris. Apply a suitable air filter cleaning solution to both the inside and outside of the filter media and allow it to soak for approximately 10 minutes.

Rinse the filter using low-pressure water from the clean side outward until the water runs clear. Shake off excess water and allow the filter to air dry completely in a clean environment. Once dry, apply air filter oil evenly according to product specifications and allow the oil to wick through the media for approximately 20 minutes before reinstalling. Do not oil a wet filter.

Sound Characteristics

Intake Sound: The open-element filter and high-flow intake design create a deeper and more aggressive intake tone during acceleration, while remaining controlled and refined during normal driving.

Compatibility Notice: This cold air intake system is designed specifically for 1999–2000 Honda Civic Si models equipped with the 1.6L 4-cylinder engine. Vehicle verification is recommended prior to purchase.

Engineered to improve airflow efficiency, throttle response, and overall driving engagement, this intake system delivers reliable performance gains, enhanced sound, and long-term durability without compromising daily drivability.

Engine Safety Rating
Difficulty 

Fitment

Make

Honda

Engine Size
  • 1.6L

Year
  • 1999
  • 2000

Installation & Tools

The Wrench Time

  • Estimated Time: 60-90 Minutes
  • Difficulty: 3/10 - Straightforward bolt-on for the EM1 chassis, requiring removal of the lower bumper clips and splash shield to extract the factory resonator box.

Tools You Will Need

  • 10mm socket and 3/8-inch ratchet (with 6-inch extension)
  • 10mm combination wrench
  • 8mm socket or flathead screwdriver (for silicone coupler hose clamps)
  • Trim panel popper tool or flathead screwdriver (for splash shield plastic clips)
  • Needle-nose pliers (for factory crankcase breather tube spring clamp)
Mechanic’s Pro Tip (The "Gotcha"):
On the 1999-2000 Honda Civic 1.6L Si (B16A2), the OEM Intake Air Temperature (IAT) sensor is pressed directly into the rubber factory intake tube. Do NOT pry on the plastic body with metal tools or pull by the wiring harness; these 20+ year-old Honda sub-harness clips are extremely brittle. Gently lubricate the rubber grommet around the sensor with a dab of soapy water or silicone spray and twist the sensor housing out using your bare hands to avoid cracking the plastic connector housing.

Phase 1: Removing the Factory Part from your 1999-2000 Honda Civic 1.6L

  1. Disconnect the Battery: Always start by disconnecting the negative battery terminal using a 10mm wrench to prevent electrical shorts and reset the ECU baseline trim values.
  2. Unplug and Remove the IAT Sensor: Locate the 2-pin Intake Air Temperature (IAT) sensor on the side of the factory intake arm. Depress the release tab on the wiring clip gently and disconnect the harness. Carefully wiggle the sensor out of its rubber grommet and set it aside in a clean tray.
  3. Disconnect the Crankcase Breather: Use needle-nose pliers to slide back the spring clamp on the valve cover breather hose, then pull the rubber hose off the OEM intake tube port.
  4. Remove the Upper Airbox: Using a 10mm socket, loosen the hose clamp securing the intake tube to the throttle body. Use a 10mm socket with a 6-inch extension to remove the factory airbox mounting bolts, then lift the upper tube and air filter housing out of the engine bay.
  5. Drop the Lower Resonator Box: Turn the front wheels fully to the left. Using a trim panel popper tool, remove the plastic retaining clips on the front passenger inner fender liner and pull the liner back. Reach up to access the OEM resonator box (“milk jug”) and remove the mounting bolts using a 10mm socket and extension. Drop the resonator assembly out through the bottom splash guard opening to clear space for the new cold air tube.

Phase 2: Installing the Cold Air Intake

  1. Install the Throttle Body Coupler: Slide the silicone reducer/coupler onto the throttle body opening. Secure it using an 8mm nut driver or flathead screwdriver on the worm-gear clamp. Leave it slightly loose for final rotational adjustment.
  2. Mount the Intake Tube and Filter: Guide the lower cold air intake pipe down through the chassis hole into the fender well void where the OEM resonator was removed. Attach the high-flow air filter element to the end of the lower pipe inside the bumper cavity and tighten its clamp using an 8mm socket. Connect the upper intake pipe to the throttle body coupler.
  3. Secure the Vibration Mount: Align the bracket on the intake tube with the factory chassis mounting point. Fasten the provided rubber anti-vibration mount and lock nut using a 10mm wrench to keep the tube from rattling against the chassis inner fender cut-out.
  4. Reinstall the IAT Sensor and Breather: Insert the factory rubber grommet into the pre-drilled bung on the new intake pipe. Push the OEM IAT sensor firmly into the grommet until fully seated, then reconnect the 2-pin harness connector until it clicks. Connect the supplied silicone or OEM vacuum line from the valve cover breather port to the intake tube nipple using needle-nose pliers.
  5. Tighten Hardware and ECU Relearn: Reinstall the fender liner using your trim panel popper to seat the push clips. Double-check all clamp tightness with your 8mm nut driver, ensuring no metal-on-metal chassis contact. Reconnect the negative battery terminal using a 10mm wrench. Start the vehicle and let it idle for 20 seconds without touching the gas pedal so the ECU can adapt to the increased airflow profile.

Disclaimer: This is a general guide provided for the 1999-2000 Honda Civic 1.6L. Always refer to your factory service manual for exact torque specifications and safety procedures.

Warranty

All products are backed by our Limited Lifetime Warranty. We stand by our quality. [See terms]
Cold Air Intake for Honda Civic SI (1999-2000) 1.6L L4 Engine

$89.99