These little guys are basically seals. They sit right where the exhaust manifold bolts up to the engine block, and they create a tight, airtight connection. They fill in any tiny imperfections in the mating surfaces, preventing exhaust gases from leaking out. They’re usually made of a pretty heat – resistant material, like a special type of rubber or a composite, because, well, they're right next to a hot exhaust system. Think of it like this, your exhaust system is designed to get those gases from the engine, through the catalytic converter, and out the tailpipe. This O – ring helps ensure all those gases stay inside that system. It’s part of a larger gasket set, but this specific ring often seals around exhaust manifold bolts or studs, helping to maintain consistent pressure and prevent leaks at those key points. A leaking exhaust manifold can cause all sorts of problems. You’ll notice if one develops – a hissing or ticking sound, especially when the engine is cold, is a pretty common sign. It can also lead to a loss of engine power because the engine isn’t scavenging exhaust efficiently. Beyond that, exhaust leaks are dangerous. Those gases are toxic, and you don't want them creeping into the cabin. Replacing these O – rings is a relatively inexpensive fix that can save you bigger headaches down the road. You can find them easily enough – places like Fixparts Online carry a good range of these engine parts. It's usually best to replace the entire exhaust manifold gasket set when you're in there, just to be thorough, but these O – rings are a critical piece of that job. Stand out from the crowd: O-Ring (MPN 13541317994) has a 12-month warranty!

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