EXT462 Exhaust Headers – Mazda 3 SP20–SP25 2.0L–2.5L (2004–2014)

The EXT462 exhaust header system is designed for Mazda 3 models fitted with the LF (2.0L), L3 (2.3L) and L5 (2.5L) MZR engines found in the SP20, SP23 and SP25 variants.

These engines respond extremely well to improved exhaust flow and scavenging. The EXT462 replaces the restrictive factory catalytic converter manifold with a smoother, high-flow design, improving mid-range torque, throttle response, and overall engine efficiency.

Key Features

• Made to order – typically 2–3 weeks
• Direct-fit performance headers for Mazda 3 SP20, SP23 and SP25 (2004–2014)
• Mandrel-bent primary, secondary and outlet pipes for optimal flow
• Improved exhaust scavenging for stronger torque and response
• Precision-cut flanges for improved sealing and durability
• Australian-made for long-term performance and reliability

Technical Specifications

• Primary Pipes: 42mm [1.58"]
• Secondary Pipes: 51mm [2.00"]
• Outlet Size: 63mm [2.50"]
• Material: Mandrel-bent steel
• Gasket: Reuse original or replace if required

Fitment Notes

• SP25 models require O2 sensor extensions
• Replacement catalytic converter required
• Always check rear lower engine mounts to ensure long service life of flexible joints

Engine Airflow Data (4000 rpm @ ~85% VE)

2.0L LF (MZR): ~3,400 L/min intake → ~10,200 L/min exhaust
2.3L L3 (MZR): ~3,910 L/min intake → ~11,700 L/min exhaust
2.5L L5 (MZR): ~4,250 L/min intake → ~12,750 L/min exhaust

As exhaust gases expand significantly at operating temperature (~600°C), total exhaust volume is approximately 3× greater than intake airflow. The EXT462 header design is sized to efficiently manage this increased volume, reducing backpressure and improving engine performance.

What’s Included

• 1 x EXT462 Header Assembly

Recommended With

• Replacement catalytic converter (required for installation)
• O2 sensor wiring extension (SP25 models)

Frequently Asked Questions

Will this fit all Mazda 3 models?
This system suits Mazda 3 SP20, SP23 and SP25 models (2004–2014) with LF, L3 or L5 engines.

Is this a direct bolt-on replacement?
Yes, however a replacement catalytic converter and minor modifications (such as O2 extensions on SP25) may be required.

How long does delivery take?
These headers are made to order and typically ship within 2–3 weeks. Manufacturing times may vary depending on demand.

Customer Support

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