Parts for your 2015 Subaru Impreza-Exhaust mount

2015 Subaru Impreza exhaust mounts — what they do and when to replace them

Exhaust mounts absolutely are used on the 2015 Subaru Impreza. Subaru’s Factory Service Manual for the 2015 Impreza (GP/GJ, Exhaust section) and the Subaru Electronic Parts Catalog both show multiple rubber exhaust “insulators” (often called hangers or mounts) that support the front/centre pipe and rear muffler. They’re a standard fit across the range and are essential to how the system is supported and isolated.

On this Impreza, each exhaust mount is a tough rubber insulator that cradles a metal hanger peg on the exhaust and a matching peg on the body bracket. Their job is to carry the weight of the system, keep the muffler and pipework aligned in the tunnel, and let everything move a little as the drivetrain rocks and the pipes heat-cycle. Just as importantly, they soak up vibration so it doesn’t travel into the cabin. That’s why Subaru labels them as “insulators” in service and parts documentation.

Because they live under the car, these mounts cop heat, road grime, and splash. Over time they can harden, crack, or stretch. On a 2015 model in Aussie or Kiwi conditions, it’s smart to check them at regular services (about every 10,000–15,000 km) and expect to replace the worst ones somewhere around the 7–10 year mark, sooner if the car tows, does lots of short trips, or sees coastal corrosion.

• Common signs they’re due: thumps or rattles over bumps, a droopy tailpipe, buzzing at idle, or the muffler touching the bumper or heat shield.
• If one fails, the extra load can crack a bracket or stress a flange, so don’t leave it too long.

When replacing, use quality OEM-spec rubber mounts. A matched set helps keep the system level. A dab of silicone spray makes the old ones slide off and the new ones slip on. While you’re there, check the steel brackets for rust, make sure the heat shields aren’t loose, and centre the muffler tip in the bumper cut-out before tightening any clamps you’ve loosened. Avoid overly hard performance mounts on a daily driver, they can add cabin drone and harshness.

Technically, Subaru may list these as “Insulator – Exhaust” or “Cushion Rubber” in the EPC. Whether it’s the hatch or the sedan, those insulators are a small, inexpensive part that keeps the Impreza quiet, tidy, and compliant on Aussie and NZ roads.

How many exhaust mounts does a 2015 Impreza have?

Most Aussie/NZ-spec cars will have four to five rubber insulators: typically two at the rear muffler and two to three along the front/centre pipe. The exact count can vary a touch by body style (hatch vs sedan) and market equipment. A quick look under the rear bumper and along the tunnel will confirm what’s on the vehicle.

Can worn exhaust mounts cause vibration or drone?

Yes. Stretched or hardened mounts let the system sit off-centre or touch shields and brackets, which can create knocks, buzzing at idle, or a dull drone at certain revs. Fresh, compliant mounts restore clearance and reintroduce the vibration isolation Subaru designed into the system.

Are stiffer aftermarket mounts a good idea?

They can be for track or rally use, where controlling movement matters more than comfort. For everyday driving, OEM-style rubber is the sweet spot. Stiffer polyurethane or “race” mounts often increase noise and vibration in the cabin, especially on long motorway runs.