Parts for your 2020 Subaru Legacy-Exhaust mount

2020 Subaru Legacy exhaust-mounts: what they do and when to replace them

Yes, the 2020 Subaru Legacy absolutely uses exhaust mounts. Subaru’s factory service literature for the 2020 Legacy (Exhaust System section in the service manual/STIS) and the Subaru Genuine Parts catalogue (Exhaust group, items commonly listed as Insulator–Exhaust, Muffler Hanger and related brackets) specify multiple rubber insulators that support the front/centre pipes and rear mufflers. These mounts are essential hardware, not optional extras.

On this model, the exhaust mounts (rubber insulators) suspend the pipes and mufflers from the underbody while allowing the system to move slightly as it heats and cools. That flex keeps exhaust loads off the manifold, catalytic converters and joints, cuts vibration and drone in the cabin, and maintains proper clearance from heat shields, the subframe and bodywork. When the mounts harden, crack or stretch, the system can sag, knock on the floorpan or crossmember, and stress the flanges and flex joints—none of which is ideal for comfort or component life.

As part of regular servicing in Australia and New Zealand, it’s smart to inspect the Legacy’s exhaust mounts about once a year or every 15,000 km when the car’s on a hoist. Look for perished rubber, splits, glazing/hardening, elongated holes or a droopy muffler. Coastal use, gravel roads and frequent short trips can age the rubber faster.

• Tell-tales it’s time to replace:
  • Rattles or thuds over bumps, especially at idle or on start-up.
  • Visible contact marks where the exhaust has been touching the body or shields.
  • Sagging tailpipe alignment or uneven tip height.

Replacement is straightforward for a workshop: safely support the exhaust, unbolt any stays, lubricate the old insulators with silicone spray, lever them off the hangers, check brackets for corrosion, then fit new OE-grade insulators and verify clearances all round. It’s worth renewing mounts in pairs (or all on an axle section) so ride height and NVH stay even. Performance polyurethane hangers can be used, but they may transmit more vibration, for daily driving, Subaru OE rubber spec is typically the best balance.

Pro tips: don’t pry against thin heat shields, always support the system to avoid bending the flex section, and re-check clearances after a heat cycle. A few fresh mounts can make the Legacy quieter, reduce cabin buzz, and protect the rest of the exhaust from premature wear.

Popular questions about 2020 Subaru Legacy exhaust mounts

How often should the exhaust mounts be replaced?
There’s no fixed interval. In local conditions, many last 5–10 years, but inspection every service is recommended. Replace at the first signs of cracking, hardening, elongation or if the exhaust is knocking or sitting low.

Are upgraded polyurethane hangers a good idea?
They’re fine if tighter control is needed (e.g., spirited driving), but they can add vibration and noise. For most 2020 Legacy owners, OE-equivalent rubber insulators deliver the best comfort and durability.

What happens if a worn mount is ignored?
Ongoing knocking can damage heat shields, stress flanges and gaskets, and crack welds. It can also transfer more vibration into the cabin. Replacing tired mounts is a low-cost fix that protects pricier exhaust components.