Parts for your 2014 Subaru Exiga-Manifold gasket

2014 Subaru Exiga manifold-gasket — what it is and when to sort it

Yes, the 2014 Subaru Exiga uses manifold-gaskets. Technical documentation for the YA-series Exiga — including the Subaru Factory Service Manual (STIS) and the Subaru FAST parts catalogue — lists both intake manifold-gaskets (sealing the intake runners to the cylinder heads) and exhaust manifold-gaskets (sealing the exhaust headers to the heads) for the engines offered in 2014 (commonly the EJ20 turbo in JDM trims and the FB25 2.5‑litre in others). Genuine Subaru parts listings also specify replacement gaskets whenever manifolds are removed, which confirms the part is fitted and service-relevant on this model.

On the Exiga, the manifold-gasket’s job is straightforward but critical. The intake manifold-gasket keeps unmetered air out so the engine doesn’t run lean, idle rough or throw fuel trim codes. The exhaust manifold-gasket keeps hot gases in the exhaust stream, protecting nearby components, preventing that tell‑tale tick on cold start, and ensuring the oxygen sensors see clean, consistent flow so the ECU can fuel the engine properly. Materials vary — intake gaskets are typically moulded rubber or fibre-reinforced composites, while exhaust gaskets are usually multi‑layer steel to cope with heat and expansion.

They’re not a scheduled replacement item, but they do age with heat cycles. Any time the intake or exhaust manifold comes off — say, for spark plugs on some EJ engines, turbo work, or to sort a leak — new manifold-gaskets should go in. The Subaru workshop manuals specify cleaning the mating faces, using new gaskets only, and torquing the manifold fasteners in the correct sequence and to spec. Reusing crushed gaskets risks repeat leaks and comebacks.

• Tell‑tale signs: hissing or whistling under the bonnet, a ticking exhaust note on cold start, sulphur/exhaust odour in the cabin, sooty marks at the flange, rough idle, poor fuel economy, or codes for lean mixture (like P0171/P0174).
• Good service practice: inspect for carbon tracks or hardened, flattened sealing beads, replace any rusty studs/nuts, check manifold flatness, fit quality gaskets (genuine or reputable aftermarket), torque in stages with a cross pattern, recheck for leaks after a heat cycle.
• Handy add‑ons: if the intake is off, consider new throttle body and EGR gaskets and fresh PCV hoses, on exhaust work, assess heat shields and O2 sensor harnesses while access is easy.

Look after the manifold-gaskets and the Exiga will idle smoothly, keep cabin air sweet, and run bang on its fuel trims — the small seals doing a big job on every drive.

Popular questions about 2014 Subaru Exiga manifold-gaskets

How can someone tell if the Exiga’s manifold-gasket is leaking?
Common clues are a sharp ticking from the exhaust side on cold start that softens as it warms, or a hiss near the intake when blipping the throttle. Rough idle, a faint exhaust odour, soot marks around the exhaust flange, or fuel‑trim/lean codes can also point to a leak. A quick test is to mist soapy water around suspected areas (engine cold) and watch for bubbles as it starts, or use a smoke machine for intake leaks.

Do both intake and exhaust manifold-gaskets need replacing together?
Not necessarily. Replace what’s disturbed or what’s leaking. If the exhaust manifold is off, do both sides on that bank and use new hardware if it’s corroded. If the intake is coming off for other work, new intake gaskets are cheap insurance. There’s no harm doing both systems at once if the vehicle’s older or showing multiple symptoms.

How long does the job take and what might it cost?
Time varies with engine and access: intake manifold-gaskets are often a 1.5–3 hour job, exhaust manifold-gaskets can run 1.5–4 hours depending on seized hardware and heat shields. Gasket sets are typically modest in cost, labour is the bigger part. Pricing will swing with engine type (EJ vs FB), condition of fasteners, and whether additional bits (studs, shields, O2 sensors) are needed.