Performance Air Intake System for Honda Fit / Jazz GD3 1.5L (2006–2008) - VTEC Sound & Throttle Improvement

This performance air intake system is designed to replace the factory air box on 2006–2008 Honda Fit (Jazz) GD3 models equipped with the 1.5L L15A or L15A1 VTEC inline-4 engine. The system reduces intake restriction by eliminating the factory resonator and using mandrel-bent aluminum piping to create a direct air path to the throttle body. This results in improved throttle response, enhanced airflow efficiency, and improved performance across the RPM range.

The intake uses smooth aluminum tubing to replace the factory accordion-style intake hose and restrictive air box assembly. The mandrel-bent construction maintains consistent internal diameter throughout each bend, reducing turbulence in the intake path. The design allows the engine to breathe more efficiently, particularly in the upper RPM range where VTEC engagement occurs.

Vehicle Fitment

• 2006–2008 Honda Fit GD3 (1.5L L15A VTEC Inline-4)
• 2006–2008 Honda Fit GD3 (1.5L L15A1 VTEC Inline-4)
• 2006–2008 Honda Jazz GD3 (1.5L L15A VTEC Inline-4)
• 2006–2008 Honda Jazz GD3 (1.5L L15A1 VTEC Inline-4)
• Factory horsepower: approximately 109 HP

Performance & Design

Airflow Optimization: The system is engineered to improve airflow efficiency by eliminating the restrictive factory resonator and air box assembly. The mandrel-bent aluminum piping creates a smoother air path to the throttle body, reducing turbulence present in the factory accordion hose. The design improves engine breathing characteristics, particularly during VTEC engagement in the upper RPM range. Actual performance improvements will vary based on vehicle condition, elevation, ambient temperature, and existing modifications.

Throttle Response: The reduced intake restriction and smooth piping allow the engine to draw air more efficiently during acceleration. This results in improved throttle response and power delivery throughout the RPM range. The system is optimized for the compact engine bay layout of the GD3 chassis.

Construction & Materials

Mandrel-Bent Aluminum Construction: The intake tube is constructed from mandrel-bent polished aluminum, which provides corrosion resistance and reduces weight compared to factory plastic components. The mandrel-bent tubing maintains consistent internal diameter throughout each bend, minimizing airflow turbulence and restriction.

Filter Design: The high-flow air filter uses cotton gauze filter media that can be washed and re-oiled for continued use. The filter provides adequate filtration while maintaining lower restriction than factory paper elements. The open-element design produces a more audible intake sound, particularly during VTEC engagement when the engine enters its high-RPM power band.

Features & Components

• Mandrel-bent polished aluminum intake piping
• High-flow washable cotton gauze air filter
• Direct replacement for factory air box and resonator assembly
• Eliminates restrictive factory resonator
• Reduces intake air turbulence
• Enhances throttle response across RPM range
• Produces more audible intake sound during VTEC engagement
• Reusable filter with cleaning and re-oiling capability
• Designed specifically for GD3 chassis engine bay layout
• Direct bolt-on installation

What's Included

• Mandrel-bent aluminum intake pipe
• High-flow washable cotton gauze air filter
• Silicone couplers
• Stainless steel clamps
• Mounting hardware
• Installation components

Installation

• Direct replacement for factory air intake system
• Direct bolt-on design
• No cutting or drilling required
• Installation time approximately 45–60 minutes
• Basic hand tools required (socket set, screwdriver)
• Designed for GD3 chassis engine bay clearances

Installation Note:
Disconnect the negative battery terminal before beginning installation and leave disconnected for at least 15 minutes. This allows the engine control unit to reset fuel trim adaptations. After reconnection, the ECU will relearn the modified airflow characteristics during initial startup and normal driving operation. This reset process optimizes fuel delivery and ignition timing for the new intake system.

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 spirited driving may require more frequent inspection and cleaning.

Cleaning Procedure: Remove the filter from the intake tube. Gently tap the filter to remove loose debris. Apply an appropriate air filter cleaning solution (compatible with cotton gauze filters) to both the inside and outside of the filter element, working it into the filter media. Allow the cleaner to soak for approximately 10 minutes. Rinse the filter thoroughly with low-pressure water from the clean side out, continuing until water runs clear. Shake off excess water and allow the filter to air dry completely in a clean environment. Once fully dry, apply air filter oil evenly to the filter media according to product specifications. Allow the oil to wick through the filter material for approximately 20 minutes before reinstalling. Ensure the filter is completely dry before applying oil, as moisture will prevent proper oil absorption.

Sound Characteristics

VTEC Induction Sound: The removal of the factory resonator results in increased intake noise, particularly during VTEC engagement when the engine transitions to its high-RPM cam profile. The open-element filter design produces a more audible induction sound during acceleration compared to the factory intake system.

This performance air intake system provides improved airflow characteristics for the 1.5L L15A VTEC engine while maintaining reliable filtration through a washable, reusable cotton gauze filter. The mandrel-bent aluminum construction reduces turbulence and weight compared to factory plastic components. The system is designed specifically for the compact engine bay layout of the GD3 chassis and provides direct bolt-on installation without permanent modifications.