1990 Ford E-series Performance Exhaust Systems

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    • Flowmaster® Scavenger Series Elite Shorty Header
      (0 reviews)
      # 15657844
      Ford E-series 289 / 302 CID 1990, Scavenger Series Elite Shorty Header by Flowmaster®. Replace your restrictive factory exhaust manifolds with these stainless steel headers and let your engine breath! Their long tube design will...
      Increases horsepower and torqueImproves engine efficiency and throttle response
      $701.92
    • Flowmaster® 290 Series Stainless Steel Oval Catalytic Converter
      (1 reviews)
      # 869888
      Ford E-series 1990, 290 Series Stainless Steel Oval Catalytic Converter by Flowmaster®. 7.25" Width. The new Flowmaster replacement catalytic converters are made to meet and exceed all federal environmental regulations and, as all...
      Exceed all federal emission standardsStainless Steel shells
      $105.52 - $124.70
    • MagnaFlow® Direct Fit California Pre-OBDII Catalytic Converter
      (0 reviews)
      # 61588196
      Ford E-series 1990, Direct Fit California Pre-OBDII Catalytic Converter by MagnaFlow®. If your car needs replacement, install one that will get you through the smog check and give you more horsepower. This converter will directly...
      Increases exhaust flow compared to original factory converterIncreased exhaust flow allows your engine to make more power
      $348.51 - $521.02
    • MagnaFlow® Direct Fit Federal Catalytic Converter
      (0 reviews)
      # 61588205
      Ford E-series 1990, Direct Fit Federal Catalytic Converter by MagnaFlow®. If your car needs replacement, install one that will get you through the smog check and give you more horsepower. This converter will directly replace the...
      Increases exhaust flow compared to original factory converterIncreased exhaust flow allows your engine to make more power
      $271.74 - $341.89
    • MagnaFlow® Direct Fit Federal OBDII Catalytic Converter
      (0 reviews)
      # 62247035
      Ford E-series 1990, Direct Fit Federal OBDII Catalytic Converter by MagnaFlow®. 7.5" Wide. Includes Gasket and Air Tube. If your car needs replacement, install one that will get you through the smog check and give you more...
      Increases exhaust flow compared to original factory converterIncreased exhaust flow allows your engine to make more power
      $357.92
    • Bosal® Catalytic Converter
      (0 reviews)
      # 20559825
      Ford E-series 1990, Catalytic Converter by Bosal®. If you’re in need of a replacement catalytic converter, you can’t do better than Bosal. They’re a leading supplier to vehicle manufacturers and use advanced manufacturing...
      Constructed to meet your vehicle’s specific emissions requirementsRadial flow concept allows for an even distribution of the gas flow in the converter for the optimal conversion of harmful gases
      $295.27
    • Spectre Performance® Exhaust Header Gaskets
      (0 reviews)
      # 12054154
      Ford E-series 1990, Exhaust Header Gaskets by Spectre Performance®. Rooted in racing, Spectre Performance designs and builds every product with the same goal in mind - the best performance in the market proven on the racetrack! All...
      High-tech engine parts for the most power and best performanceThe finest exterior and interior parts for superior appearance and functionality
      $8.35 - $16.70
    • BBK® Premium™ Header Gasket Set
      (0 reviews)
      # 55186130
      Ford E-series 1990, Premium™ Header Gasket Set by BBK®. These premium steel core graphite gaskets are flexible for a long lasting leak-proof seal even when cylinder head and header flange surfaces aren’t perfectly flat. They...
      Provides a long lasting, leak-proof sealFlexible graphite will conform to surface irregularities and won’t stick to headers or cylinder head
      $14.99 - $39.99
    • Bosal® Exhaust Flange Gasket
      (0 reviews)
      # 20559844
      Ford E-series Inlet 1990, Exhaust Flange Gasket by Bosal®. Bosal has a vast selection of all necessary accessories and hardware to help you make the exhaust system installation or repair job quick and easy. Choose Bosal, and you'll...
      Constructed for a hassle-free exhaust repairEnsures a precise fit
      $5.90
    • COMP Cams® Exhaust Header Gasket
      (0 reviews)
      # 14311937
      Ford E-series 1990, Exhaust Header Gasket by COMP Cams®. Header Gasket; Small Block Ford; 1.30in.x 1.60in.
      $35.80
    • Edelbrock® Exhaust Gasket
      (0 reviews)
      # 17606504
      Ford E-series 5.0L Small Block 1990, Exhaust Gasket by Edelbrock®. Port: 1.25"x1.48". Any gasket can create a seal, but a good gasket can do it with less clamping force, and for a longer period of time. Edelbrock's gaskets are not...
      Fast shipping; 1-2 day delivery time regardless of where you’re locatedThe finest quality at a great price
      $18.56
    • Walker® Direct Fit Catalytic Converter
      (0 reviews)
      # 35462478
      Ford E-series 1990, Direct Fit Catalytic Converter by Walker®. This catalytic converter is constructed specially for your vehicle to directly replace the original equipment part and comes ready to install. The part is designed to...
      Designed to meet your vehicle’s specific emissions requirementsDirect fit replacement
      $203.53 - $290.75
    • Walker® Universal Fit Catalytic Converter
      (0 reviews)
      # 17728236
      Ford E-series 1990, Universal Catalytic Converter by Walker®. This part features the correct load of precious metals to ensure the proper limitation of tailpipe emissions. It is designed to meet the EPA policy and emission...
      Constructed to meet your vehicle’s specific emissions requirementsFeatures stainless steel body with aluminized steel pipe and heat shields
      $66.99 - $119.75
    • DEC® Catalytic Converter
      (0 reviews)
      # 7641259
      Ford E-series 1990, Catalytic Converter by DEC®. Is your car noisier these days? Can you smell exhaust fumes in the cabin? Exhaust system repairs should not be put off, both for safety and legal reasons, but before you waste your...
      $728.93
    • Walker® Heavy Duty Muffler
      (0 reviews)
      # 18123924
      Ford E-series 1990, Heavy Duty Muffler by Walker®. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust job. When you choose...
      Makes installation quick and easyAn economical replacement for OE components
      $60.92 - $69.67
    • Walker® Quiet-Flow™ Muffler
      (0 reviews)
      # 18155098
      Ford E-series 1990, Quiet-Flow Muffler by Walker®. Together with delivering OE-style sound, the Quiet-Flow Muffler features 100% structural stainless steel construction that resists rust three times longer than aluminized mufflers...
      Designed for OE equivalent sound and precision fitSpun-locked heads for a proper resistance to backfire
      $61.38 - $147.52
    • Walker® SoundFX™ Direct Fit Muffler
      (0 reviews)
      # 18168350
      Ford E-series 1990, SoundFX Direct Fit Muffler by Walker®. This muffler is the right choice if you opt for quality acoustics and performance. Walker offers 100% aluminized steel SoundFX Mufflers with direct fit and universal fit...
      Designed to deliver ultimate performance and pleasing sound qualityOE-equivalent direct-fit design
      $45.65 - $65.72
    • Walker® SoundFX™ Universal Muffler
      (0 reviews)
      # 18173204
      Ford E-series 1990, SoundFX Universal Muffler by Walker®. This muffler is the right choice if you opt for quality acoustics and performance. Walker offers 100% aluminized steel SoundFX Mufflers with direct fit and universal fit...
      Designed to deliver ultimate performance and pleasing sound qualityUniversal fit – may require a few modifications to install
      $32.06
    • Walker® Tru-Fit Universal Fit Muffler
      (0 reviews)
      # 35462442
      Ford E-series 1990, Tru-Fit Universal Muffler by Walker®. The Tru-Fit Universal Muffler is designed to provide installers and DIY users with optimum performance and quality acoustics at an affordable price. This 100% aluminized...
      Economical performance and acousticsUniversal fit allows for greater installation flexibility
      $33.37
    • Walker® H-Pipe
      (0 reviews)
      # 35462536
      Ford E-series V8 1990, H Pipe by Walker®. If you want exhaust piping that delivers precise OE-style fit, appearance, and reliability, this part is your number one choice. Every pipe is vehicle-specific and is manufactured using...
      Designed to directly replace the factory partMade with precision benders and fixture checked
      $124.10
    • Walker® Tail Pipe
      (0 reviews)
      # 18177677
      Ford E-series 1990, Tail Pipe by Walker®. If you want exhaust piping that delivers precise OE-style fit, appearance, and reliability, this part is your number one choice. Every pipe is vehicle-specific and is manufactured using...
      Designed to directly replace the factory partMade with precision benders and fixture checked
      $26.55 - $65.24
    • Walker® Y-Pipe
      (0 reviews)
      # 35462533
      Ford E-series V8 1990, Y Pipe by Walker®. If you want exhaust piping that delivers precise OE-style fit, appearance, and reliability, this part is your number one choice. Every pipe is vehicle-specific and is manufactured using...
      Designed to directly replace the factory partMade with precision benders and fixture checked
      $182.03
    • Walker® Reducer
      (0 reviews)
      # 35462525
      Ford E-series V8 1990, Reducer by Walker®. If you want exhaust piping that delivers precise OE-style fit, appearance, and reliability, this part is your number one choice. Every pipe is vehicle-specific and is manufactured using...
      Designed to directly replace the factory partMade with precision benders and fixture checked
      $7.20 - $15.13
    • Walker® Air Tube Kit
      (0 reviews)
      # 35462428
      Ford E-series 1990, Air Tube Kit by Walker®. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust job. When you choose Walker...
      Makes installation quick and easyOptimal OE-style fit and quality
      $23.24
    • Mr. Gasket® Header Install Kit
      (0 reviews)
      # 12330540
      Ford E-series 5.0L 1990, Header Install Kit by Mr. Gasket®, Includes Header Exhaust/Collector Flange Gasket/Header and Collector Flange Bolts. Whatever exhaust system you install on your engine, whether it’s a set of chromed...
      $31.50
    • Taylor Cable® Seal-4-Good™ Exhaust Header Gaskets
      (0 reviews)
      # 9384049
      Ford E-series V8 1990, Seal-4-Good™ Exhaust Header Gaskets by Taylor Cable®. Don’t put up with that ominous, unmistakable “tick, tick, tick” sound of an exhaust manifold leak. If it isn’t leaking air into the manifold and...
      $33.74
    • Taylor Cable® XX Carbon™ Exhaust Header Gaskets
      (0 reviews)
      # 9386885
      Ford E-series V8 1990, XX Carbon™ Exhaust Header Gaskets by Taylor Cable®. These extreme high-temperature gaskets are well-suited for highly-modified engines: turbocharged, supercharged, nitrous or fuel. This is a premium,...
      $18.79 - $20.92
    • Dorman® Exhaust Manifold
      (0 reviews)
      # 16498022
      Ford E-series 1990, Exhaust Manifold by Dorman®, 1 Pieces. More like a complete kit than a single part, many of the Exhaust Manifolds include gaskets and hardware for a complete installation. Since this part is a direct...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $64.91 - $240.43
    • Dorman® Exhaust Manifold Hardware Kit
      (0 reviews)
      # 62445821
      Ford E-series 1990, Exhaust Manifold Hardware Kit by Dorman®, 1 Pieces. More like a complete kit than a single part, many of the Exhaust Manifolds include gaskets and hardware for a complete installation. Since this part is a...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $9.15 - $14.48
    • Dorman® Exhaust Manifold Studs and Nuts
      (0 reviews)
      # 31591636
      Ford E-series 1990, Exhaust Manifold Studs and Nuts by Dorman®, 1 Pieces. Packaging Type: Card. More like a complete kit than a single part, many of the Exhaust Manifolds include gaskets and hardware for a complete installation....
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      $9.12 - $13.29
    • Fel-Pro® Exhaust Manifold Gasket Set
      (0 reviews)
      # 19060645
      Ford E-series 1990, Exhaust Manifold Gasket Set by Fel-Pro®. If you need durable gaskets to prevent leaks on your vehicle, Fel-Pro is the way to go. Engineered using the latest technologies and global engineering resources, the...
      Direct OEM replacement for a proper fitEnsure reliable sealing performance
      $9.40 - $17.70
    • Victor Reinz® Exhaust Manifold Gasket
      (0 reviews)
      # 24115780
      Ford E-series 1990, Exhaust Manifold Gasket by Victor Reinz®, Use 1 per Car. When you’re low on oil, coolant or some other fluid, you may be tempted to just run down to the local auto parts chain store. But before you waste your...
      $9.98 - $26.54
    • Victor Reinz® Intake and Exhaust Manifolds Combination Gasket
      (0 reviews)
      # 24046093
      Ford E-series 4.9L 1990, Intake and Exhaust Manifolds Combination Gasket by Victor Reinz®, Use 1 per Car. Includes: Plenum Gasket. OEM Standard. Material: Nitroseal. Included: Plenum Chamber Gasket. When you’re low on oil,...
      $17.78
    • Walker® Muffler Strap
      (0 reviews)
      # 35462440
      Ford E-series 1990, Muffler Strap by Walker®. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust job. When you choose Walker...
      Makes installation quick and easyOptimal OE-style fit and quality
      $7.12
    • Mr. Gasket® Exhaust Gasket Set
      (0 reviews)
      # 12326978
      Ford E-series 5.0L 1990, Exhaust Gasket Set by Mr. Gasket®. Whatever exhaust system you install on your engine, whether it’s a set of chromed headers or simply a set of cleaned up flat black rams horn manifolds, you’ll need...
      $33.18 - $37.17
    • Mr. Gasket® Exhaust Gasket Set
      (0 reviews)
      # 12304705
      Ford E-series 5.0L 1990, Exhaust Gasket Set by Mr. Gasket®. Port Dimensions 1.25" Width x 1.75" Height. Oval Port.
      $19.38
    • Mr. Gasket® MLS Exhaust Gasket
      (0 reviews)
      # 12304799
      Ford E-series 5.0L 1990, MLS Exhaust Gasket by Mr. Gasket®. Rectangular Port.
      $26.79
    • Mr. Gasket® Ultra-Seal™ Exhaust Gasket Set
      (0 reviews)
      # 12367105
      Ford E-series 1990, Ultra-Seal™ Exhaust Gasket Set by Mr. Gasket®. Whatever exhaust system you install on your engine, whether it’s a set of chromed headers or simply a set of cleaned up flat black rams horn manifolds, you’ll...
      $28.11 - $35.10
    • Dorman® Exhaust Flange Stud and Nut
      (0 reviews)
      # 31658824
      Ford E-series 4.9L / 5.0L / 5.8L / 7.5L 1990, Exhaust Flange Stud and Nut by Dorman®, 1 Piece. Front. This is an aftermarket part that replaces factory OE # 375636S7, 389112S2, 391104S100, 391104S2, N806227S100, N806227S301....
      Direct replacement for a proper fit every timeDurable steel construction
      $8.56
    • Walker® Clamp
      (1 reviews)
      # 8743970
      Ford E-series 1990, Clamp by Walker®. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust job. When you choose Walker...
      Makes installation quick and easyOptimal OE-style fit and quality
      $1.64 - $2.37
    • Walker® Gasket
      (0 reviews)
      # 35462490
      Ford E-series V8 1990, Gasket by Walker®. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust job. When you choose Walker...
      Makes installation quick and easyOptimal OE-style fit and quality
      $7.91
    • Walker® Muffler Exhaust Heat Shield
      (0 reviews)
      # 35462436
      Ford E-series 1990, Muffler Exhaust Heat Shield by Walker®. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust job. When you...
      Makes installation quick and easyOptimal OE-style fit and quality
      $12.79
    • Fel-Pro® Exhaust Pipe Flange Gasket
      (0 reviews)
      # 19067296
      Ford E-series 1990, Exhaust Pipe Flange Gasket by Fel-Pro®. If you need durable gaskets to prevent leaks on your vehicle, Fel-Pro is the way to go. Engineered using the latest technologies and global engineering resources, the...
      Direct OEM replacement for a proper fitEnsure reliable sealing performance
      $7.31 - $8.57
    • Victor Reinz® Exhaust Pipe Flange Gasket
      (0 reviews)
      # 24115804
      Ford E-series 1990, Exhaust Pipe Flange Gasket by Victor Reinz®, Use 1 per Car. OEM Standard. When you’re low on oil, coolant or some other fluid, you may be tempted to just run down to the local auto parts chain store. But...
      $8.56 - $8.96
    • Eastern® Direct Fit Catalytic Converter
      (0 reviews)
      # 17571966
      Ford E-series 1990, Direct Fit Catalytic Converter by Eastern Catalytic®. If you need to replace your failed or damaged catalytic converter, this product is the right choice. Designed specifically for your vehicle, this catalytic...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      $225.72 - $305.21
    • Eastern® Universal Fit Catalytic Converter
      (0 reviews)
      # 17577722
      Ford E-series 1990, Universal Fit Catalytic Converter by Eastern Catalytic®. Keep your exhaust emissions within specifications and your vehicle running in top condition with this quality product. Made of stainless steel, the...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      $61.21 - $63.30
    • Taylor Cable® Graph-Flex™ Exhaust Header Gaskets
      (0 reviews)
      # 9380995
      Ford E-series V8 1990, Graph-Flex™ Exhaust Header Gaskets by Taylor Cable®. These durable header flange gaskets are composed of a graphite composition material on a malleable stainless steel core. They’ll seal up tight on...
      $20.70 - $23.04
    • Flowmaster® 10 Series Delta Force Single Chamber Race Muffler
      (0 reviews)
      # 898490
      Universal 10 Series Delta Force Single Chamber Race Muffler by Flowmaster®, AGGRESSIVE SOUND. The 10 Series Race mufflers are a compact lightweight single chamber design that will give a noticeable sound reduction compared to open...
      Race Proven TechnologyNoticeable Sound Reduction Compared to Open Headers
      $75.62 - $146.90
    • Flowmaster® 30 Series Delta Force™ 3-Chamber Race Muffler
      (0 reviews)
      # 898450
      Universal 30 Series Delta Force™ 3-Chamber Race Muffler by Flowmaster®, AGGRESSIVE SOUND. These are the most powerful and the quietest professional race mufflers available. 5.00” & 6.00” thick case sizes for maximum power and...
      Race Proven TechnologyDelta Force Technology for Maximum Torque and Power
      $128.25 - $267.60
    • Flowmaster® 40 Series Delta Force™ 2-Chamber Race Muffler
      (0 reviews)
      # 898479
      Universal 40 Series Delta Force™ 2-Chamber Race Muffler by Flowmaster®, AGGRESSIVE SOUND. The 40-Series mufflers offer a combination of maximum power and substantial dB-reduction compared to open headers. They are recommended for...
      Race Proven TechnologyDelta Force Technology for Maximum Torque and Power
      $105.98 - $230.86
    • Flowmaster® 60 Series Delta Force Stainless Steel Race Muffler
      (0 reviews)
      # 3146020
      Universal 60 Series Delta Force Stainless Steel Race Muffler by Flowmaster®, MODERATE SOUND, 4" Offset Inlet / 4" Offset Outlet, 22" Length. These are the most powerful and the quietest professional race mufflers available.
      Race Proven TechnologyNoticeable Sound Reduction Compared to Open Headers
      $197.26
    • Flowmaster® Outlaw™ Race Muffler
      (1 reviews)
      # 898456
      Universal Outlaw™ Race Muffler by Flowmaster®, AGGRESSIVE SOUND. These mufflers are very small and lightweight. Attached directly to the collector they generally produce more power than open headers, while taking “the edge”...
      Race Proven TechnologyPure Race Muffler
      $89.00 - $134.32
    • Flowmaster® Pro Series Outlaw™ Race Muffler
      (0 reviews)
      # 62419096
      Universal Pro Series Outlaw™ Race Muffler by Flowmaster®, AGGRESSIVE SOUND. Inlet / Outlet Position: Center. Outlet Diameter: 3". Body Height: 5". Body Width: 5". Body Length: 9". These mufflers are very small and lightweight....
      Race Proven TechnologyPure Race Muffler
      $89.00
    • Flowmaster® Pro Series™ Stainless Steel Race Muffler with Turn Down
      (1 reviews)
      # 898465
      Universal Pro Series™ Stainless Steel Race Muffler with Turn Down by Flowmaster®, MODERATE SOUND, 6" Diameter x 16" Case Length. Laminar Flow Mufflers have applications in all forms of racing. The Cool Shell Technology makes...
      Race Proven Patented Laminar Flow TechnologyProven to Reduce dB Levels with no Reduction of Engine Performance Level
      $188.87
    • Flowmaster® Scavenger Series Outlaw II Race Collector Muffler
      (0 reviews)
      # 23297627
      Universal Scavenger Series Outlaw II Race Collector Muffler by Flowmaster®. These Delta Force Mufflers are designed to attach directly to the exhaust header primary tubes, replacing the collector in sprint and drag racing...
      Race Proven TechnologyAttach to Exhaust Header Primary Tubes
      $187.86 - $208.84
    • Flowmaster® Scavenger Series Race Collector Muffler
      (0 reviews)
      # 898468
      Universal Scavenger Series Race Collector Muffler by Flowmaster®. These Delta Force Mufflers are designed to attach directly to the exhaust header primary tubes, replacing the collector in sprint and drag racing applications. They...
      Race Proven TechnologyAttach to Exhaust Header Primary Tubes
      $167.54
    • Flowmaster® 40 Series Delta Flow™ Muffler
      (1 reviews)
      # 897054
      Universal 40 Series Delta Flow™ Muffler by Flowmaster®, AGGRESSIVE SOUND, 4" Thick x 9.75" Wide x 13" Case Length x 19" Overall Length. The 2-chamber design of this muffler, incorporating the patented Flowmaster Delta Flow...
      The Quietest Option in the 40 Series Two Chamber LineLess Resonance than other 40 Series Mufflers
      $87.08 - $108.08
    • Flowmaster® 40 Series Original Muffler
      (0 reviews)
      # 897079
      Universal 40 Series Original Muffler by Flowmaster®, AGGRESSIVE SOUND, 4" Thick x 9.75" Wide x 13" Case Length x 19" Overall Length. This is the muffler that launched the success of Flowmaster. It is an aggressive sounding...
      The Original High Performance Flowmaster MufflerrAggressive Sound for the Enthusiasts Who Love Their Exhaust to be LOUD
      $87.08
    • Flowmaster® 50 Series Delta Flow™ Slimline Muffler
      (0 reviews)
      # 897156
      Universal 50 Series Delta Flow™ Slimline Muffler by Flowmaster®, MODERATE SOUND. The 50 Series Delta Flow Slimline mufflers are designed for passenger cars. The sound characteristics are moderate exterior sound level and minimal...
      Three Chamber Delta Flow TechnologyFully MIG-Welded for Maximum Durability
      $134.99 - $139.56
    • Flowmaster® 60 Series Delta Flow™ Muffler
      (0 reviews)
      # 897052
      Universal 60 Series Delta Flow™ Aluminized Steel Muffler by Flowmaster®, MILD SOUND, 2.25" Center Inlet / 2.25" Center Outlet, 5" Thick x 10" Wide x 13" Case Length x 19" Overall Length. The 60 Series increases horsepower and...
      A Favorite With Import and Sport Compact OwnersBest When Matched for Four and Six Cylinder Engines
      $131.18



    Guides & Articles
    Regardless of whether you're shopping for a simple replacement muffler that delivers original equipment (OE) sound and performance or an upgraded muffler which provides a deeper growl with increased power through freer exhaust flow, you'll see choices between "direct fit" mufflers and "universal" mufflers. In this article, we'll help you understand the differences...
    It has been a battle of the ages to make exhaust sound like it should. Having less bends or turns will not only improve the sound but also performance. A custom exhaust is always an option for the race inspired and spirited weekend warriors. Our manufactures offer everything needed to build a custom exhaust to your preference.
    Headers are installed because the stock exhaust manifolds usually flow poorly. An exhaust header has individual tubes for each exhaust port, allowing each exhaust pulse to flow unobstructed from the cylinder head. The tubes on headers are usually larger in diameter than the runners on an exhaust manifold and the tubes are mandrel bent for gradual radius bends.
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