Parts for your 2018 Subaru Impreza-Exhaust mount

2018 Subaru Impreza exhaust mount: purpose, care and when to replace

Exhaust mounts are absolutely relevant to the 2018 Subaru Impreza. Technical sources including the Subaru Workshop/Service Manual (Exhaust section, MY2017–MY2019), Subaru genuine parts catalogues (Exhaust > Hangers/Insulators), and OEM-style technical catalogues for replacement components all show multiple rubber exhaust hangers/insulators and brackets supporting the front/centre pipe and rear muffler on this model. So yes—this vehicle is fitted with exhaust mounts from factory.

On the Impreza, the exhaust mounts (often called hangers or insulators) are small rubber or polyurethane bushings that hold the exhaust in its correct position while letting it move a touch. Their job is to cushion vibration, allow for heat expansion and engine movement, and keep the pipework and muffler from knocking on the underbody. Healthy mounts protect the catalytic converter, O2 sensor wiring and joints by preventing excess stress and sagging.

When these mounts age, the rubber can harden, crack, stretch or tear. That can lead to rattles over bumps, a thunk on startup or shut-down, a visibly low-hanging muffler, or even strained flanges and leaks. Leaving them too long can damage the flex section or stress the welds, turning a cheap fix into a spendy one.

As part of regular servicing, it’s smart to have the Impreza’s exhaust mounts checked on a hoist. A quick visual every service or 20,000 km is plenty: look for perished rubber, splits, elongation of the holes, shiny witness marks from contact, and rusty or bent brackets. If one is failing, replacing the set in that area (for example, both rear muffler mounts) helps keep alignment tidy.

• Replacement tips: support the exhaust with a jack stand, spritz the old hangers with silicone spray, and lever them off the pegs. Fit quality OEM-style EPDM rubber or reputable polyurethane if firmer support is desired (noting firmer mounts can add a touch of vibration).
• Good practice: recheck clearances around the subframe, bumper and heat shields, and tighten any related brackets to the workshop manual spec.

Most 2018 Imprezas run several mounts along the system, with twin hangers at the rear muffler and one or more along the mid-pipe. In normal Aussie and Kiwi conditions they often last many years, but vehicles that see lots of short trips, coastal air, or unsealed roads may need them sooner. At the first sign of rattle or sag, fresh mounts are a quick, low-cost win for quiet, drama-free motoring.

Popular questions about 2018 Subaru Impreza exhaust mounts

How many exhaust mounts does a 2018 Subaru Impreza have?
Most examples have multiple mounts across the system—typically a couple at the rear muffler and one or more along the mid/centre pipe. Trim and exhaust layout can vary slightly, so workshop diagrams or a quick inspection on a hoist will confirm the exact count on a given car.

How often should the mounts be replaced?
There’s no fixed interval. Inspect them at each service, many last well past 60,000–100,000 km. Replace any mount that’s cracked, hardened, stretched or letting the exhaust sit off-centre or touch the body.

Is it safe to drive with a broken exhaust mount?
It may drive, but it’s not ideal. A missing or torn mount can let the exhaust bang on the underbody, stress joints and flex sections, and potentially lead to leaks. It’s best to sort it promptly to avoid knock-on damage.