Parts for your 2007 Honda Stream-Exhaust gasket

2007 Honda Stream exhaust gasket: what it does and when to replace

Based on Honda technical literature for the RN6–RN9 series (2007 Honda Stream) and Honda Electronic Parts Catalogue diagrams for the exhaust system, this model does use exhaust gaskets. These include a cylinder head–to–exhaust manifold gasket, and a spring-joint “donut” gasket between the manifold/catalyst outlet and the front pipe, plus flange gaskets further downstream depending on variant. That means an exhaust-gasket is very much relevant to a 2007 Honda Stream.

On the 2007 Stream, the exhaust gasket’s job is to seal hot gases as they exit the engine and travel through the catalytic converter and pipes. The head-to-manifold gasket is a metal or multi-layer steel piece designed to handle extreme heat and pressure. The spring-joint donut sits between tapered flanges and flexes slightly with engine movement, keeping the joint sealed without needing big torque on the fasteners. Together they prevent leaks, protect the catalyst’s efficiency, and keep the cabin free of fumes.

Typical signs a Stream’s exhaust gasket is on the way out include a ticking or raspy note at cold start that softens as it warms up, whiffs of exhaust odour near the engine bay or under the car, black sooty traces around a joint, and sometimes a loss of low‑down torque. If a leak is upstream of the oxygen sensors, the ECU can be fooled, which may show up as poor fuel economy or a warning light.

Best practice on these cars is to replace any disturbed exhaust gasket whenever the joint is undone—donuts and manifold gaskets are single‑use. On coastal Aussie and Kiwi cars, corrosion around the spring bolts and flanges is common, so plan on new spring bolts and nuts along with the gasket. Clean the mating faces, align the joint squarely, and torque fasteners to the service manual spec with the engine cold. Don’t smear RTV or paste on the head-to-manifold or donut joints, use the correct OEM‑style gasket. After first start, let it heat-cycle, then listen for leaks and recheck fastener seating if the manual calls for it.

• Inspect for leaks at each service, especially around the manifold heat shield and front pipe joint.
• If the system’s coming off for other work (e.g., catalyst or front pipe), budget fresh gaskets as part of the job.
• By 150–200,000 km, age and heat cycling often justify proactive replacement if joints look tired.

Popular questions about 2007 Honda Stream exhaust-gasket

Does a 2007 Honda Stream actually have an exhaust gasket?
Yes. Honda’s RN6–RN9 Stream platform uses a metal manifold gasket at the cylinder head and a spring-joint donut gasket between the manifold/catalyst and the front pipe, with additional flange gaskets further back on some trims. These are listed in Honda’s service information and parts catalogues.

What are the symptoms of a leaking exhaust gasket on a Stream?
Expect a sharp ticking on cold start, a faint exhaust smell around the engine bay or underfloor, and black soot marks at the joint. If the leak is ahead of the O2 sensor, it can skew fuelling and lead to rough running or higher fuel use. Left alone, it can also stress the catalyst.

Should sealant be used with the exhaust gasket?
Generally, no. The head-to-manifold MLS gasket and the spring-joint donut are designed to seal dry when installed correctly and torqued to spec. Only use sealants if a specific slip-joint or flange in the Honda procedure calls for it—otherwise stick with quality OEM-style gaskets and new hardware.