Parts for your 2018 Holden Commodore-Exhaust mount

2018 Holden Commodore exhaust mounts — what they do and how to look after them

Yes, an exhaust-mount is absolutely used on the 2018 Holden Commodore (ZB). Technical documentation backs this up: the GM Service Information (GMSi) for the ZB Commodore/Opel Insignia B includes procedures titled Exhaust Muffler Replacement and Exhaust Pipe Hanger/Insulator Replacement, complete with diagrams of rubber insulators and brackets along the system. The GM Electronic Parts Catalogue for the same model family also lists Insulator, Exhaust System and related hanger brackets for various powertrains (2.0T FWD and 3.6L AWD). In short, the vehicle relies on multiple exhaust mounts (rubber hangers/insulators and metal brackets) from the front pipe through to the rear mufflers.

On the ZB Commodore, those exhaust mounts do the heavy lifting of suspending the exhaust while isolating engine and road vibrations from the cabin. The rubber insulators let the system move slightly under load and thermal expansion, keeping the pipework centred in the underbody tunnels and away from heat shields, the subframe and the bumper. FWD 2.0T models typically run hangers at the front pipe, centre resonator and rear mufflers, while the V6 AWD adds extra supports near the rear subframe to control the additional mass and twin-outlet layout.

There’s no fixed replacement interval, but routine servicing should include a quick inspection. Good workshops check for cracked, perished or oil-soaked rubber, elongated holes in the insulators, missing or bent brackets, contact marks on the exhaust or heat shields, and abnormal droop of the tailpipes. Tell-tales that mounts are on the way out include knocks over bumps, a buzz at idle, rattles on start-up and tailpipes sitting off-centre.

When replacement’s due, support the exhaust with a stand before removing any hangers, and work on a cool system. A spritz of silicone spray helps slide rubber insulators off their pegs without tearing. Replace any distorted brackets and single‑use fasteners as specified in the workshop manual, and torque fasteners to spec. If one insulator has failed from age, it’s smart to replace the set on that section so the heights match. After refit, check tailpipe alignment in the bumper cut-outs and confirm there’s clearance to shields and the rear valance under load. Owners keen on DIY can use dedicated exhaust-hanger pliers, but axle stands and proper support are a must.

• Inspect mounts at each service or after any underbody knock.
• Use OE-quality rubber insulators matched to the variant (FWD/AWD, single/twin outlet).
• Recheck clearances and listen for rattles after a short road test.

Popular questions about 2018 Holden Commodore exhaust mounts

How can someone tell the exhaust mounts need attention on a 2018 Commodore?
Common signs include a thud or rattle from the rear over bumps, buzzing at certain revs, tailpipes that sit low or off-centre, and visible cracks or stretching in the rubber hangers. If the exhaust taps a heat shield or subframe, the mounts are usually tired or a bracket is bent. A quick inspection on a hoist will confirm it.

Are the exhaust mounts the same across 2.0T FWD and 3.6L AWD models?
Not always. The AWD V6 uses additional hangers and different bracket geometry around the rear subframe and twin-outlet section. Rubber insulators may look similar but can vary in hardness and shape. It’s best to order by VIN or build code so the insulator and bracket match the exact variant.

Is replacing an exhaust mount a DIY job?
It can be, provided the car is safely supported, the exhaust is cool and the system is properly braced before a hanger is removed. Silicone spray and exhaust-hanger pliers make the job easier. If brackets are bent, fasteners seized or alignment needs correction, a workshop with a hoist can sort it quickly.