Left side of a Ford Cologne V6 engine, clearly showing a (rusty) cast iron exhaust manifold - three exhaust ports into one pipe.
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Exhaust Headers

In automotive engineering, an intake manifold or inlet manifold is a part of an engine that supplies the fuel/air mixture to the cylinders. An exhaust manifold or header collects the exhaust gases from multiple cylinders into one pipe. more...

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Due to the suction effect of the downward movement of the pistons in a reciprocating piston engine, a partial vacuum (lower than atmospheric pressure) exists in the intake manifold. This manifold vacuum can be used as a source of automobile ancillary power to drive auxiliary systems: (ignition advance, power assisted brakes, cruise control, windscreen wipers, power windows, ventilation system valves, etc).

This vacuum can also be used to 'suck' any piston blow-by gases from the engine's crankcase. This is known as a closed crankcase ventilation or positive crankcase ventilation (PCV) system. This way the gases are burned with the fuel/air mixture.

The intake manifold is located between the carburetor and the cylinder head. On multi point injected engines, the intake manifold holds the fuel injectors.

Exhaust manifolds are generally and traditionally simple cast iron units which collect engine exhaust and deliver it to the exhaust pipe. However, when greater performance is required, this restrictive tube is often replaced with individual headers which are tuned for low restriction and improved performance. Headers have been widely available from aftermarket sources for decades, and some manufacturers have begun using them as original equipment. The Honda J30A2 engine does away with exhaust manifolds altogether, using an integral engine block passage to route gases directly to the catalytic converter.

See also: engine tuning

Read more at Wikipedia.org


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Nissan Infiniti 350z G35 Header Y-Pipe Vq35de V6 03-06Nissan Infiniti 350z G35 Header Y-Pipe Vq35de V6 03-06 $99.99 Nissan 350z G35 Header Y Pipe Vq35de 03-06 Stainless Nissan 350z G35 Header Y Pipe Vq35de 03-06 Stainless $188.99
Hooker Headers 2101Hkr Headers Super Competition BlockHooker Headers 2101Hkr Headers Super Competition Block $569.95 Obx Cat Back Catback Exhaust System Scion xb 04-06Obx Cat Back Catback Exhaust System Scion xb 04-06 $215.00
Ford Focus 00-05 Zx3/Zx5 Dohc 2.0L Zetec Headers Ford Focus 00-05 Zx3/Zx5 Dohc 2.0L Zetec Headers $129.87 Summit Headers 1964-1973 Chevy Chevelle G9001-9Summit Headers 1964-1973 Chevy Chevelle G9001-9 $209.95
FlowTech Shorty Smog Header 91627-1FltFlowTech Shorty Smog Header 91627-1Flt $349.95 95 Windstar L. Exhaust Manifold 6-232 3.8L Front95 Windstar L. Exhaust Manifold 6-232 3.8L Front $25.00
Triumph Spitfire exhaust header 54Triumph Spitfire exhaust header 54 $29.00 Edelbrock 65923 Header Shorty Steel Ti-Tech Coated JeepEdelbrock 65923 Header Shorty Steel Ti-Tech Coated Jeep $379.95
Boss 302 headers 69-70 mustang cougarBoss 302 headers 69-70 mustang cougar $75.00 Header Insulation Wrap or Exhaust Wrap Black 50' rollHeader Insulation Wrap or Exhaust Wrap Black 50' roll $24.95
Edelbrock 6550 Headers Upsweep Dragster 2.25 in.Edelbrock 6550 Headers Upsweep Dragster 2.25 in. $936.69 Gibson Chrome 00-03 Dodge Dakota 4.7L HeadersGibson Chrome 00-03 Dodge Dakota 4.7L Headers $342.70
Edelbrock 66663 Headers Shorty Stainless Steel Ti-TechEdelbrock 66663 Headers Shorty Stainless Steel Ti-Tech $489.95 06 07 08 09 Lucerne R. Exhaust Manifold 4.6L Rear06 07 08 09 Lucerne R. Exhaust Manifold 4.6L Rear $25.00
exhaust shorty header flange pipe 2 1/2 inch kit exhaust shorty header flange pipe 2 1/2 inch kit $30.00 Bbk Performance 15290 Headers Equal Length Shorty SteelBbk Performance 15290 Headers Equal Length Shorty Steel $349.99
Flaming River Fr50001C Headers Shorty Steel CeramicFlaming River Fr50001C Headers Shorty Steel Ceramic $449.95 Bbk Full-Length Header 15330Bbk Full-Length Header 15330 $569.99
Bbk Performance 4002 Headers Shorty Steel Chrome ChevyBbk Performance 4002 Headers Shorty Steel Chrome Chevy $329.99 PaceSetter Performance 70-1387 Headers Shorty SteelPaceSetter Performance 70-1387 Headers Shorty Steel $183.95
Hooker 10808 Exhaust Gasket JegsHooker 10808 Exhaust Gasket Jegs $11.99 Honda Civic/Crx 88-00 1.5/1.6L D16 Stainless HeaderHonda Civic/Crx 88-00 1.5/1.6L D16 Stainless Header $89.97
Summit Headers 1982-1991 Pontiac Firebird G9005Summit Headers 1982-1991 Pontiac Firebird G9005 $99.95 Hooker Super Competition Header 2841-1HkrHooker Super Competition Header 2841-1Hkr $749.95
64 falcon headers 289 30264 falcon headers 289 302 $75.00 Dynatech 401-909201P Headers Full-Length Steel PaintedDynatech 401-909201P Headers Full-Length Steel Painted $309.38
Bbk Equal Length Shorty Header 15120Bbk Equal Length Shorty Header 15120 $349.99 Hedman Block Hugger Street Rod Hedder 88420Hedman Block Hugger Street Rod Hedder 88420 $189.95
Doug's Headers D369 Headers Full-Length Steel CeramicDoug's Headers D369 Headers Full-Length Steel Ceramic $579.95 A Body Fenderwell Headers 440 Dart A Body Fenderwell Headers 440 Dart $36.00
95-05 Pontiac Sunfire Vibrant Catback Exhaust 1722E95-05 Pontiac Sunfire Vibrant Catback Exhaust 1722E $408.00 1966 67 fairlane headers 390 gt 428 427 Fe Hooker 61131966 67 fairlane headers 390 gt 428 427 Fe Hooker 6113 $122.50
Thorley Headers 289Yc Headers Tri-Y Steel Ceramic CoateThorley Headers 289Yc Headers Tri-Y Steel Ceramic Coate $629.95 390 428 427 360 f150 f250 4x4 headers new390 428 427 360 f150 f250 4x4 headers new $31.00
Hedman Elite Hedder 89840Hedman Elite Hedder 89840 $355.95 Hooker Headers 2452-1Hkr Headers CompetitionHooker Headers 2452-1Hkr Headers Competition $379.95
Dynatech MuscleMaxx Header 401-912201Dynatech MuscleMaxx Header 401-912201 $409.38 Small Block Chevy Black Truck Street Hot Hugger HeadersSmall Block Chevy Black Truck Street Hot Hugger Headers $64.95
Bbk Cnc Series Performance Header 3510Bbk Cnc Series Performance Header 3510 $269.99 Jdm Dc2 Integra Type R Race Exhaust Header B16 B18C5 Jdm Dc2 Integra Type R Race Exhaust Header B16 B18C5 $369.99
3' exhaust header collector with turn downs flange kit3' exhaust header collector with turn downs flange kit $45.00 Bmw 2002 Base Model 67-76 Shorty Exhaust Header HeadersBmw 2002 Base Model 67-76 Shorty Exhaust Header Headers $314.99
Hedman Street Hedder 68096Hedman Street Hedder 68096 $489.95 Hedman 69820 Headers Elite Full-Length Chevy 396-454Hedman 69820 Headers Elite Full-Length Chevy 396-454 $305.95
PaceSetter Header 70-1279PaceSetter Header 70-1279 $168.99 Chevrolet Competion Hooker Headers R2463 1 NrChevrolet Competion Hooker Headers R2463 1 Nr $99.99
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Prices current as of last update, 03/12/10 9:27am.

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