Parts for your 2017 Subaru Outback-Exhaust mount

2017 Subaru Outback Exhaust Mounts: What They Do and When to Replace Them

Based on Subaru’s factory service information for the 2015–2019 Outback platform and the official Subaru parts catalogue (listing the exhaust “insulator”/mount, e.g. OE hanger insulators used across BS/BS9 Outback models), the 2017 Subaru Outback absolutely uses exhaust mounts. They’re not a niche accessory—these rubber insulators are essential components that suspend the exhaust, keep it quiet, and let it move a touch without knocking.

On a 2017 Outback, the exhaust mounts (often called hangers or insulators) isolate vibration, maintain correct pipe and muffler alignment, and allow the system to flex with engine movement and bumps. That stops droning in the cabin and prevents hard stress on flanges, welds and the catalytic converter. Subaru’s service procedures show multiple rubber mounts along the mid-pipe and at the dual rear mufflers, so if any of them perish, the exhaust can sag or tap the body.

They’re simple bits of rubber, but they cop heat, road grime and a fair bit of movement. Over time they harden, crack, or stretch. When that happens, the Outback might make a thud over speed humps, a metallic rattle at idle, or the tailpipes may sit crooked in the bumper cut-outs.

• Tell-tale signs: drooping mufflers, tapping over bumps, exhaust touching a heat shield, visible cracks or “elongated” holes in the rubber.
• When to act: inspect at every service, many owners replace mounts at 5–8 years or 100–150,000 km, sooner in coastal areas or if you tow.
• Good practice: replace mounts in pairs (or all at once) to keep alignment true.

Replacement is straightforward with the right prep. Let the exhaust cool, support it with a stand or jack, then use silicone spray and exhaust-hanger pliers to slip the old insulators off the pegs. Fit new OE-spec rubber insulators (Subaru “exhaust insulator” parts) or quality equivalents, making sure any orientation markers face correctly. Before tightening bracket fasteners, check clearances around the subframe, bumper, and towbar, then snug everything to the torque values in the Subaru service manual. After a short drive, recheck alignment and listen for any contact or new noises.

For touring and daily use, OE rubber is a safe bet. If the Outback runs on rough roads or carries a towbar and bikes often, slightly firmer aftermarket options can hold alignment better—just be mindful that very stiff mounts can pass a bit more vibration into the cabin.

FAQs

How many exhaust mounts does a 2017 Subaru Outback have?
Most 2017 Outbacks run five to six rubber mounts: several along the mid/centre section and two per rear muffler. Exact count can vary slightly by engine and exhaust configuration.

How often should the exhaust mounts be replaced?
There’s no fixed interval—inspect at every service. In typical Aussie and Kiwi conditions, many mounts last 5–10 years. Replace sooner if there’s cracking, stretching, or any knocking/rattle.

Are polyurethane exhaust mounts a good upgrade?
They can hold alignment well and resist heat, handy for towing or rough roads. Choose the right durometer and confirm clearances, note that very firm mounts may transmit more vibration than OE rubber.