The exhaust manifold collects the exhaust gas from the cylinder head exhaust ports and channels them to a single outlet, connected to an exhaust pipe. The exhaust gases continue flowing through pipes in the system, through the interconnected catalytic converter and muffler, and out the tailpipe at the rear of the vehicle. The manifold is secured to the cylinder head and exhaust pipe with bolts or studs and nuts, and these junctures are sealed with gaskets.

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Most exhaust manifolds are cast iron, however some are made of steel or stainless steel. Heat shields are mounted on some manifolds to protect other components from their extreme heat, and on some applications to prevent exposing the cabin floor to excessive heat, which could make driving very uncomfortable. On some vehicles the oxygen sensor, which signals the exhaust oxygen content to the engine control module, is mounted on the exhaust manifold.

In-line 4-cylinder and 6-cylinder engines typically have one exhaust manifold, while V6 and V8 engines have two, one for each cylinder bank. The exhaust pipe that connects to the manifolds on V-type engines is called a Y-pipe, but some engines have a manifold crossover pipe that connects the manifolds, and only one exhaust pipe that exits from one manifold. Exhaust manifolds are generally one of the most reliable components in the exhaust system, but because they are continually exposed to extreme temperature cycles, along with other factors, occasionally replacement may be warranted.

The tremendous difference between cold and normal operating temperature that occurs over thousands of cycles can cause the manifold to crack or warp. A cracked manifold will result in an exhaust leak and noise, with the potential for noxious exhaust fumes to enter the cabin. A warped manifold may not seal against the cylinder head properly, which could also result in an exhaust leak. Rust is a common problem with cast iron manifolds and this can result in seized and broken studs, and corroded surfaces that may no longer seal properly. It’s also common for heat shields to crack and cause a rattling noise.

Regardless of the exhaust manifold malady, we can help with replacement components that will look, fit, and function just like original equipment parts, but for much less. We have exhaust manifolds, exhaust manifolds with integrated catalytic converters, manifold and exhaust pipe gaskets, studs/nuts, bolts, crossover pipes, and everything else exhaust manifold related. Many of our manifolds and manifolds with integrated converters come as complete kits with all gaskets, hardware, and shields (as required) included, so one part number gets you everything you need to complete the job.

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Guides & Articles

  • Replacement Exhaust Parts
    Exhaust Clamps, Gaskets & Hangers | Don’t Skimp on the Small Stuff!
    Exhaust system gaskets, clamps, and hanger pieces are probably some of the most overlooked parts on your entire vehicle. Since you don't see them, clean them, or maintain them, they're usually out of mind until they become degraded and fail. And degraded they are, because whenever exhaust pipes and mufflers are replaced, these old support pieces are usually always corroded beyond the point of re-using.
  • Performance Exhaust Systems
    Why Do Some Replacement Exhaust Manifolds Come With Catalytic Converters?
    If you're looking for a replacement exhaust manifold, you may notice that the choices available for your specific vehicle are only available with an "integrated" catalytic converter. In the same way, a search for a replacement catalytic converter may only turn up "combination" converter/manifold products.

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Exhaust Manifolds Reviews

Average rating:  4.5  4.6 - 62 reviews
Read All Exhaust Manifolds Reviews
5 of 5
Great Replacement Part
Look and quality is identical to original. Fit was perfect.
RPosted by Richard (Chickasha, OK) /
1970 Oldsmobile 442
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