On the exhaust side of things, it's typically not called a "manifold" unless it's connected to a turbo.
On our cars we call them headers. Headers connect between exhaust ports on the engine block and the rest of the exhaust. This is where exhaust from multiple cylinders are merged into one(for single bank engines) or two pipes(for V engines)
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PPE Headers SS/Coated/Wrapped | Ebay y-pipe | Custom 3" single exhaust w/ Magnaflows | UpRev | Racingbrake 2pc Rotors | 40th calipers | Eibach sways | SPL endlinks, diff mounts | RJM pedal | Stillen Intakes, UDP, Flywheel | M370 Manifold | Z1 engine mounts, CSC-EK, Clutch | Forgestar F14 18x10 | Conti DWs | Quaife diff/4.08 gears | Nismo diff cover
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