Parts for your 2013 Subaru Legacy-Exhaust gasket

2013 Subaru Legacy exhaust gasket — purpose, replacement and care

Yes, the 2013 Subaru Legacy uses exhaust gaskets. This is clearly shown in Subaru’s Factory Service Manual for the 2013MY Legacy/Outback (Exhaust section) and the Subaru FAST parts catalogue (Group 44: Exhaust), which list multiple gaskets at the manifold-to-head, manifold/front pipe “donut” joint and the mid/rear flange joints. Those documents also flag gaskets as replace-after-removal items. So, for this model, an exhaust gasket isn’t just relevant — it’s essential.

On a 2013 Legacy, exhaust gaskets seal the joints so exhaust gases can flow smoothly without leaks, rattles or fumes. The cylinder head–to–manifold gasket is usually a multi-layer steel piece designed to handle heat cycles without crushing out. Further back, the spring-bolted joint uses a crush ring “donut” gasket to allow a bit of movement while maintaining a tight seal. Flange gaskets at the centre and rear sections round it out. If any of these leak, the car can sound tinny, smell of exhaust, and even skew O2 sensor readings — leading to rough running or higher fuel use.

Subaru’s service literature advises replacing disturbed exhaust gaskets during any exhaust or engine work. It’s a small cost that prevents comebacks. When servicing a Legacy’s exhaust, it pays to:

• Fit new gaskets whenever a joint is undone.
• Use the correct type: MLS at the head, crush ring at the spring joint, proper flange gaskets elsewhere.
• Install gaskets dry — no sealant is typically required or recommended.
• Renew spring bolts and hardware if corroded, torque to factory specs.
• Check flanges for flatness and clean mating faces before assembly.

Owners can keep an ear and nose out for early clues. A light ticking on cold start that softens warm, a raspy note on acceleration, or a sooty stain around joints are classic signs. Any exhaust odour in the cabin should be treated as urgent from a safety point of view. During routine servicing (say every 10,000–15,000 kilometres), a quick visual of the flanges, springs and hangers, and a check for leaks, is smart preventative maintenance. If the exhaust has been apart for clutch, engine, or transmission work, budgeting for fresh gaskets is the right move — they’re designed to seal once and retire gracefully.

Popular questions about 2013 Subaru Legacy exhaust gaskets

Where are the exhaust gaskets located on a 2013 Legacy?
They sit at the cylinder head–to–manifold joint, the manifold/front pipe spring-joint (the “donut” gasket), and at the mid-pipe and rear muffler flanges. Subaru’s service manual and parts catalogue list each of these positions for the 2013 model range.

Do the exhaust gaskets need replacing whenever the exhaust is removed?
Yes. Subaru’s factory guidance treats these as replace-after-removal items. Re-using crushed gaskets risks leaks, noise, and false O2 readings. Fresh gaskets and, where needed, new spring bolts help ensure a proper seal.

What are the signs of a blown exhaust gasket on this model?
Common tells include a ticking sound on cold start, a sharper or raspy exhaust note, faint exhaust odour, and soot marks at a joint. Some cars may show poor fuel economy if a leak affects O2 sensor readings upstream.