Holden HQ HJ HX HZ 6cyl V8 Factory Single Exhaust Muffler M2648

M2648 muffler assembly is a factory-fit replacement designed for selected Holden HQ, HJ, HX and HZ Sedan, Wagon and Ute models fitted with 6-cylinder or V8 engines and a factory-style single exhaust system.

The M2648 is designed to replace the corresponding original-style muffler assembly while retaining the factory-type exhaust layout. It features a 1 7/8" inlet spigot and 1 5/8" outlet spigot.

Because HQ–HZ Holdens have been on the road for many years, exhaust systems may have been replaced, modified or upgraded. Check the existing muffler and pipe diameters before ordering to confirm that the M2648 matches the exhaust system currently fitted to your vehicle.

Key Features

• Factory-fit replacement muffler assembly
• Designed for selected Holden HQ, HJ, HX and HZ models
• Suitable for selected 6-cylinder and V8 applications
• For vehicles fitted with a factory-style single exhaust system
• 1 7/8" inlet
• 1 5/8" outlet
• Direct-fit design where the original exhaust configuration is retained
• Quality replacement exhaust component

Vehicle Fitment

• Make: Holden
• Model: HQ / HJ / HX / HZ
• Body: Sedan / Wagon / Ute – selected applications
• Engine: 6-Cylinder and V8 – selected applications
• Exhaust: Factory-style single exhaust system

Muffler Specifications

• Part Number: M2648
• Type: Factory-Fit Muffler Assembly
• Inlet: 1 7/8"
• Outlet: 1 5/8"
• Exhaust Configuration: Single exhaust

Fitment Notes

What's Included

• 1 x M2648 muffler assembly

Recommended With

• C8 – front exhaust clamp
• C5 – rear exhaust clamp
• Replacement exhaust rubbers and mounting hardware where required

Installation Tips

• Check the existing exhaust pipe and muffler spigot sizes before removing the original muffler.
• Lubricate old exhaust clamps, nuts, bolts and mounting rubbers with WD-40 or a similar penetrating lubricant before removal.
• Inspect adjoining exhaust pipes for rust, distortion or damage before installation.
• Replace badly corroded clamps, bolts and mounting components where required.
• Align the complete exhaust system before fully tightening the clamps.
• Check that the exhaust has adequate clearance from the body, suspension and driveline before driving the vehicle.

Warranty & Compliance

Frequently Asked Questions

Does M2648 suit Holden HQ, HJ, HX and HZ?
Yes. M2648 is designed for selected Holden HQ, HJ, HX and HZ Sedan, Wagon and Ute models fitted with a compatible factory-style single exhaust system.

Does this muffler suit both 6-cylinder and V8 models?
Yes. M2648 is listed for selected 6-cylinder and V8 applications using the compatible factory-style single exhaust system.

Will this fit a twin exhaust system?
No. This listing is for vehicles fitted with a compatible factory-style single exhaust system. Twin and performance exhaust systems generally use a different muffler and pipe configuration.

What size are the muffler connections?
The M2648 has a 1 7/8" inlet and 1 5/8" outlet. We recommend checking the exhaust currently fitted to the vehicle before ordering.

Why do I need to check the pipe sizes?
HQ–HZ Holdens are now many years old and the original exhaust system may have been replaced or modified. Checking the existing pipe and muffler spigot sizes helps confirm that M2648 is suitable for the exhaust system currently fitted.

Are the exhaust clamps included?
No. The C8 front clamp and C5 rear clamp are available separately where required.

Can I pick up from the store?
Yes. Pick up is available but must be pre-arranged before collection.

How much is freight?
Freight varies depending on your delivery location and where stock is available. Please contact us for freight charges before ordering. Where possible, we can arrange dispatch from the nearest available product location to help reduce freight costs and delivery times.

Customer Support

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