Mazda 323 1977–1984 1.3L 1.4L 1.5L Round Port Hurricane Headers – HU103STM

Hurricane HU103STM headers (extractors) are designed for Mazda 323 1.3L, 1.4L and 1.5L petrol engine applications from 1977–1984 fitted with round-port cylinder heads. Featuring mandrel-bent 38mm primary pipes and a 45mm outlet, these headers are designed to improve exhaust flow, torque, throttle response and engine performance.

IMPORTANT: Round-port cylinder heads only. Confirm the engine, exhaust port configuration and header mounting pattern before ordering.

Please check availability and current lead time before ordering.

Key Features

• Mandrel Bent
• Australian made

Construction

• Mild steel

Additional Options

• HG110: Header gasket, available separately
• Exhaust system connection or adaptation may be required depending on the existing system

Vehicle Fitment

• Make: Mazda
• Model: 323
• Years: 1977–1984, subject to engine and cylinder-head compatibility
• Engine sizes: 1.3L, 1.4L and 1.5L applications
• Cylinder head: Round exhaust ports only
• Important: Engine codes and exhaust flange patterns vary between Mazda 323 generations. Confirm compatibility before ordering.

Header Specifications

• SKU: HU103STM
• Primary pipes: 38mm
• Secondary pipes: Not applicable
• Outlet: 45mm
• Pipe bending: Mandrel bent
• Manufacture: Australian made

Fitment Notes

• ROUND PORT CYLINDER HEADS ONLY
• Confirm engine code, exhaust port shape and flange bolt pattern before ordering
• Early Mazda 323 models used TC 1.3L and UC 1.4L engines; later models used different engine families
• Fitment to E3, E5 and other later engine variants must be confirmed individually
• May require adaptation to the existing exhaust system
• HG110 header gasket recommended, sold separately

What's Included

• 1 × Hurricane Headers SKU: HU103STM

Recommended With

• HG110: Header gasket, available separately

Why Good Headers and Exhaust Systems Matter

• On average, a 1.3L engine draws ~2,600 L of air per minute and expels ~7,800 L per minute at 4000rpm
• On average, a 1.4L engine draws ~2,800 L of air per minute and expels ~8,400 L per minute at 4000rpm
• On average, a 1.5L engine draws ~3,000 L of air per minute and expels ~9,000 L per minute at 4000rpm

Installation Tips

• Confirm cylinder-head exhaust port shape before removing the original manifold
• Check flange alignment and engine-bay clearance during trial fitting
• Use a suitable new header gasket
• Inspect existing engine mounts and exhaust supports
• Check exhaust connections for leaks after installation

Warranty & Compliance

• Australian-made exhaust header component
• Warranty applies to the supplied part only, subject to applicable Australian Consumer Law rights

Frequently Asked Questions

Will HU103STM fit all Mazda 323 models from 1977–1984?
No. Fitment depends on the engine, cylinder-head exhaust port shape and mounting pattern. Please confirm these details before ordering.

Will these headers fit 1.3L, 1.4L and 1.5L engines?
These engine sizes are listed as potential applications, but different Mazda engine families were used during this period. Confirm compatibility with your particular engine before ordering.

Will these headers fit square-port cylinder heads?
No. HU103STM is intended for compatible round-port cylinder heads only.

How can I tell if my Mazda cylinder head has round or square exhaust ports?
The exhaust port shape is normally hidden behind the exhaust manifold. Check your engine code and any casting numbers on the original manifold, or contact us with your vehicle details and engine photographs. These may help identify the correct application without removing the manifold. If the engine or cylinder head has been modified, physical inspection may be necessary.

Are these headers a direct bolt-on replacement?
The header must match the engine's exhaust port and mounting arrangement. Adaptation to the existing exhaust system may be required.

Is the header gasket included?
No. The recommended HG110 gasket is available separately.

Are these headers mandrel bent?
Yes. Hurricane HU103STM headers feature mandrel-bent pipework.

What size is the header outlet?
The outlet measures 45mm. Confirm the existing exhaust connection before installation.

Are these headers Australian made?
Yes. Hurricane HU103STM headers are Australian made.

How long before my headers are available?
Please check availability and current lead time before ordering.

Can I collect my order?
Yes. Pickup must be pre-arranged. Please contact us before ordering to confirm availability and arrange collection.

How much is freight?
Freight varies depending on delivery location and stock availability. Please contact us before ordering if you require a freight quotation.

Do you ship to the USA?
Yes. Best Mufflers regularly ships exhaust systems and exhaust parts to customers throughout the United States. Please note that import duties, tariffs, taxes, and customs clearance fees are not included in the product or shipping price. Once your order is processed and the applicable charges are calculated, we will send you a secure payment link to finalise the import duties and tariff charges before dispatch.

Customer Support

For phone orders, advice, or part enquiries – contact us: