Parts for your 2008 Honda Stream-Exhaust gasket

2008 Honda Stream exhaust gasket: what it does and when to replace it

Technical sources confirm the 2008 Honda Stream does use exhaust gaskets. Honda’s Service Manual for the Stream RN6–RN9 (2007–2014) and the Honda Electronic Parts Catalogue list both an exhaust manifold gasket (cylinder head to manifold) and a front exhaust pipe “donut” gasket at the catalytic converter/front pipe joint, specified for replacement when disturbed. That makes the exhaust-gasket relevant to every 2008 Honda Stream, whether running the 1.8 R18A or 2.0 R20A engine.

On this model, the exhaust-gasket’s job is to seal hot gases so they flow through the cat and mufflers, not out into the engine bay or underbody. A healthy seal keeps noise down, prevents exhaust smells getting into the cabin, and helps the oxygen sensors read accurately so the engine management can keep fuel economy tidy and emissions in check. It also protects nearby components from heat and soot.

Owners will usually replace these gaskets whenever an exhaust joint is separated for repairs or mods, and any time a leak shows up. Common tell-tales include a ticking or chuffing sound on cold start, a sharp exhaust odour around the bonnet or firewall, sooty marks at a flange, a louder note, or slightly lazier performance and fuel economy. Because leaks can affect emissions, they can trip up a WOF in NZ or a roadworthy/rego inspection in Australia.

Best practice on a 2008 Honda Stream service is to use quality OEM-spec gaskets. The manifold gasket is typically a multi-layer steel piece that should be renewed if the manifold’s been off. The front pipe uses a crush/donut gasket, replace it if the joint’s been opened or if there’s any pitting on the sealing faces. Clean the flanges, check studs and spring-bolts, fit the new gasket in the correct orientation, and tighten to the specified torque. If spring-bolts are corroded or weak, swap them out so the joint can flex without leaking.

DIYers can help themselves by soaking stubborn fasteners with penetrant ahead of time and using a six-point socket. A light dab of high-temp anti-seize on threads (not on the sealing face) makes the next service easier, but avoid contaminating oxygen sensors. After the first drive, a quick listen for any hiss or tick is a smart move.

• Typical signs of a leaking exhaust-gasket on a Stream: ticking on start-up, soot at joints, exhaust smell near the cabin, louder exhaust note, minor loss of pep.

Referencing: Honda Stream RN6–RN9 Service Manual, “Exhaust System”, Honda Electronic Parts Catalogue (EPC) listings for Exhaust Manifold Gasket and Front Exhaust Pipe Gasket for 2008 model year.

Popular questions

Does the 2008 Honda Stream have more than one exhaust-gasket?
Yes. There’s a manifold-to-head gasket and a front pipe “donut” gasket at the catalytic converter/front pipe joint. Some variants may also use a gasket at the rear muffler flange. If any of these joints are opened or show signs of leakage, the gasket should be replaced.

Is it safe to drive with a leaking exhaust-gasket on a 2008 Honda Stream?
Short trips might be possible, but it’s not recommended. Leaks can allow fumes into the cabin, skew oxygen-sensor readings, and increase noise. Left long enough, a hot leak near the head can erode nearby components. It’s wise to sort it promptly to avoid failing a WOF or roadworthy check.

What does it cost to replace an exhaust-gasket on a 2008 Honda Stream?
As a ballpark in AU/NZ, a front pipe donut gasket is typically $20–$70 for quality parts, with 0.5–1.0 hour labour. A manifold gasket job is more involved: $40–$120 in parts and 1.0–2.0 hours labour depending on access and corrosion. Actual pricing varies by workshop and condition.