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