Parts for your 2018 Subaru Forester-Exhaust mount

2018 Subaru Forester exhaust-mount: purpose, checks and easy replacement tips

Technical confirmation: The 2018 Subaru Forester (SJ) does use exhaust mounts (also called exhaust hangers or insulators). The Subaru Factory Service Manual for the SJ Forester, Exhaust section, shows multiple hanger brackets and rubber insulators supporting the front pipe, centre section and rear muffler. Subaru’s Illustrated Parts Catalogue for the 2018 Forester likewise lists “Insulator – Exhaust Hanger” and matching bracket hardware for this model. So an exhaust-mount is absolutely fitted and serviceable on this vehicle.

On the 2018 Forester, the exhaust-mount’s job is simple but vital: hold the exhaust in the correct position while soaking up vibration so it doesn’t boom through the cabin or bump into the body, crossmember or rear bumper. The rubber insulators flex with engine movement and heat expansion, keeping the system quiet and clear of underbody bits when driving over corrugations, towing, or tackling steep driveways.

Because they live under the car, these mounts cop heat, road grime, and occasional splashes of oils and solvents. Over time the rubber hardens, cracks, or stretches. When that happens, the exhaust can sag or shift off-centre, causing rattles on cold start, thuds over bumps, or a knocking sound when turning or loading up a hill. Left too long, a drooping system can stress welds and joints.

Best practice during regular servicing is a quick visual and hands-on check of each mount. On a Forester there are several along the system, typically from the front pipe to the rear muffler. They should be intact, springy and not oil-soaked. If any look perished, elongated, or split, replacement is inexpensive and quick.

• Inspection timing: have them checked at routine services or every 20,000–30,000 kilometres, and after any off-road trips or bottom-outs.
• Replacement tips: support the exhaust with a stand, spritz the rubber with silicone spray, then lever the old insulators off the pegs. Avoid petroleum grease on rubber. Fit new insulators the same orientation as removed, then confirm clearances around the subframe, heat shields and bumper.
• Quality choice: OEM-style rubber keeps comfort stock-quiet. Stiffer polyurethane suits towing, off-road use, or heavier aftermarket exhausts, but may pass a touch more vibration.
• Hardware check: if a hanger bracket is rusty or bent, replace it and torque the fasteners to the service manual spec.

A fresh set of mounts restores proper exhaust alignment, keeps things rattle-free, and protects gaskets and welds for the long haul.

How many exhaust mounts are on a 2018 Forester?

Most 2018 Forester SJ models run several rubber insulators across the front pipe, centre section and rear muffler—typically around four to five pieces. Exact count can vary with engine and exhaust layout. A quick look underneath will confirm what’s fitted on the specific vehicle.

Can worn exhaust mounts cause vibration or knocking?

Yes. If the rubber hardens or stretches, the system can sit off-centre and contact heat shields or the subframe. That often shows up as a buzz on start-up or a thud over bumps. Replacing the tired insulators usually sorts it straight away.

Should they be replaced in pairs or as needed?

They can be done individually, but replacing mounts in the same area together helps keep alignment even. If one insulator has perished, the others are often close behind—doing them as a small set saves repeat visits.