Aftermarket Exhaust Manifold Fitment vs OEM Comparison
OEM exhaust manifolds usually fit best; aftermarket only makes sense when the engine code and flange pattern match exactly.

OEM exhaust manifolds usually fit best; aftermarket only makes sense when the engine code and flange pattern match exactly.

Exhaust manifold leaks are usually faster and sharper, while lifter tick is softer and higher on the engine. Use sound location, cold-start behavior, and a quick inspection to separate them.

Shorty and stock exhaust manifolds match on bolt pattern and port shape, while runner length, outlet position, and overall envelope usually change.

Cast iron favors heat retention and durability; tubular favors flow and bay clearance. Compare flange flatness, tube gauge, collector fit, and crack risk.

Match the exhaust port to the head and gasket first; header ports should be equal or up to about 1/16 inch larger.

Set tube size by engine output, place one flex section near the engine, support each major mass, and keep welded sections removable for service.

Match the head-side dimensions and outlet location before anything else. This guide covers gasket fit, flange thickness, hardware, flatness, and clearance checks.

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