1984 Grand Marquis Performance Exhaust Systems

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    • (0 reviews)
      $83.20$66.56
      Mercury Grand Marquis 1984, 220 Series Stainless Steel Oval Catalytic Converter by Flowmaster®, 2" Inlet / 2" Outlet. 14" Length. 6.13" Width. Includes Heat Shield, 4 Bolt Flanges. The new Flowmaster replacement catalytic...
      # 34451555
    • (0 reviews)
      $159.29from $127.43 - $290.83
      Mercury Grand Marquis 5.0L 1984, Direct Fit Pre-OBDII Catalytic Converter by MagnaFlow®. 10" Wide. If your car needs replacement, install one that will get you through the smog check and give you more horsepower. This converter...
      # 42443416
    • (0 reviews)
      $133.40from $106.72 - $110.24
      Mercury Grand Marquis Base / LS 5.0L 1984, Direct Fit Undercar Catalytic Converter by Eastern Catalytic®. If you need to replace your failed or damaged catalytic converter, this product is the right choice. Designed specifically...
      Direct OEM replacementConverts harmful engine emissions to less dangerous gases and water vapor
      # 17574479
    • (0 reviews)
      $10.44from $8.35 - $16.70
      Mercury Grand Marquis 5.0L 1984, 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...
      High-tech engine parts for the most power and best performanceThe finest exterior and interior parts for superior appearance and functionality
      # 12055837
    • (0 reviews)
      $40.63$32.50
      Mercury Grand Marquis 5.0L 1984, Exhaust Header Gasket by COMP Cams®. Header Gasket; Small Block Ford; 1.30in.x 1.60in.
      # 14325404
    • (0 reviews)
      $134.85$107.88
      Mercury Grand Marquis 5.0L 1984, Passenger Side Exhaust Manifold by Dorman®. Square Port. Material: Cast Iron. Bolt Hole Quantity: 8. With Installation Hardware. Includes: Exhaust Manifold, 1 Manifold Gasket, 4 Studs, 2 Nuts. This...
      Includes heat-shield for protection of hoses, wiring, and other engine componentsCast iron or stainless tubular construction protects against warping and/or cracking
      # 16495284
    • (0 reviews)
      $83.75from $67.00 - $131.76
      Mercury Grand Marquis 1984, 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
      # 17731944
    • (0 reviews)
      $79.30$63.44
      Mercury Grand Marquis 1984, 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...
      Designed for OE equivalent sound and precision fitSpun-locked heads for a proper resistance to backfire
      # 35477088
    • (0 reviews)
      $48.30$38.64
      Mercury Grand Marquis 1984, SoundFX™ Direct Fit Muffler by Walker®. Body Material - Steel, Color / Finish - Aluminized, Dimensions - 19" L x 9.75" W x 4.25" H, Oval Shape, Inlet Diameter - 2" ID, Outlet Diameter - 2" ID, Inlet...
      Designed to deliver ultimate performance and pleasing sound qualityOE-equivalent direct-fit design
      # 18169981
    • (0 reviews)
      $40.25$32.20
      Mercury Grand Marquis 1984, SoundFX™ Universal Muffler by Walker®. Body Material - Steel, Color / Finish - Aluminized, Dimensions - 19" L x 9.75" W x 4.25" H, Oval Shape, Inlet Diameter - 2" ID, Outlet Diameter - 2" ID, Inlet...
      Designed to deliver ultimate performance and pleasing sound qualityUniversal fit – may require a few modifications to install
      # 18173769
    • (0 reviews)
      $42.68$34.14
      Mercury Grand Marquis 1984, 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%...
      Economical performance and acousticsUniversal fit allows for greater installation flexibility
      # 35477091
    • (0 reviews)
      $142.83$114.26
      Mercury Grand Marquis 1984, H-Pipe by Walker®. Finish - Aluminized, 41.5" Overall Length, 2 Inlets, Inlet Connection Type - 2 Bolt Welded Flange, 2 Outlets, 2" Outside Outlet Diameter, Outlet Connection Type - Pipe Connection, 1...
      Designed to directly replace the factory partMade with precision benders and fixture checked
      # 18145669
    • (0 reviews)
      $28.31from $22.65 - $23.20
      Mercury Grand Marquis Sedan 1984, 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...
      Designed to directly replace the factory partMade with precision benders and fixture checked
      # 18179349
    • (0 reviews)
      $40.00$32.00
      Mercury Grand Marquis 1984, Y-Pipe by Walker®. Finish - Aluminized, 2" Pipe Diameter, 41" Overall Length, 2 Inlets, Inlet Connection Type - 2 Bolt Welded Flange, 1 Outlets, 2" Outside Outlet Diameter, Outlet Connection Type - Pipe...
      Designed to directly replace the factory partMade with precision benders and fixture checked
      # 18183632
    • (0 reviews)
      $30.19$24.15
      Mercury Grand Marquis 1984, Air Tube Kit by Walker®. 1 Inlet, 1 Outlet. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust...
      Makes installation quick and easyOptimal OE-style fit and quality
      # 18117349
    • (0 reviews)
      $35.74from $28.59 - $29.55
      Mercury Grand Marquis 5.0L 1984, 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...
      # 12330651
    • (0 reviews)
      $32.60from $26.08 - $30.70
      Mercury Grand Marquis V8 5.0L F Engine VIN Code 1984, 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...
      # 9385101
    • (0 reviews)
      $22.80$18.24
      Mercury Grand Marquis V8 5.0L F Engine VIN Code 1984, XX Carbon™ Exhaust Header Gaskets by Taylor Cable®. These extreme high-temperature gaskets are well-suited for highly-modified engines: turbocharged, supercharged, nitrous or...
      # 9387382
    • (0 reviews)
      $17.23$13.78
      Mercury Grand Marquis 1984, 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,...
      Direct OEM replacement for a proper fitEnsure reliable sealing performance
      # 19063821
    • (0 reviews)
      $16.35from $13.08 - $26.54
      Mercury Grand Marquis 1984, 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...
      # 24175754
    • (0 reviews)
      $9.18$7.34
      Mercury Grand Marquis 1984, Muffler Strap by Walker®. 34.25" Exhaust Hanger Overall Length, 1 Inlet, 1 Outlet. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with...
      Makes installation quick and easyOptimal OE-style fit and quality
      # 18158930
    • (0 reviews)
      $24.35from $19.48 - $25.23
      Mercury Grand Marquis 5.0L 1984, 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...
      # 12329592
    • (0 reviews)
      $41.48from $33.18 - $33.74
      Mercury Grand Marquis 5.0L 1984, 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...
      # 12327510
    • (0 reviews)
      $33.91$27.13
      Mercury Grand Marquis 5.0L 1984, MLS Exhaust Gasket by Mr. Gasket®. Rectangular Port.
      # 12304835
    • (0 reviews)
      $43.25from $34.60 - $35.10
      Mercury Grand Marquis 5.0L 1984, 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...
      # 12367885
    • (0 reviews)
      $2.03from $1.62 - $2.06
      Mercury Grand Marquis 1984, 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
      # 18126888
    • (0 reviews)
      $7.18$5.74
      Mercury Grand Marquis 1984, 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
      # 35477087
    • (0 reviews)
      $11.75$9.40
      Mercury Grand Marquis Wagon 1984, Hanger by Walker®. 1 Inlet, 1 Outlet. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the complete exhaust...
      Makes installation quick and easyOptimal OE-style fit and quality
      # 18147894
    • (0 reviews)
      $16.05$12.84
      Mercury Grand Marquis 1984, Muffler Exhaust Heat Shield by Walker®. 1 Inlet, 1 Outlet. With their extensive selection of accessories and hardware for the exhaust system, Walker will provide you with everything needed to do the...
      Makes installation quick and easyOptimal OE-style fit and quality
      # 18158590
    • (0 reviews)
      $4.20from $3.36 - $9.95
      Mercury Grand Marquis 1984, Exhaust Pipe Flange Gasket by Fel-Pro®. Location: Converter. 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...
      Direct OEM replacement for a proper fitEnsure reliable sealing performance
      # 18912723
    • (0 reviews)
      $15.30$12.24
      Mercury Grand Marquis 5.0L 1984, Exhaust Seal Ring by Victor Reinz®, Use 1 per Car. Exhaust Pipe to Catalytic Converter. Dimension: 2 Pipe. OEM Standard. Material: Graphite/WireMesh. Type 'F'. ID: 2.020". OD: 2.694". Thickness:...
      # 24043224
    • (0 reviews)
      $51.03$40.82
      Mercury Grand Marquis 1984, Universal Fit Catalytic Converter by Eastern Catalytic®. Whether your catalytic converter is damaged by road debris or failed due to an engine problem, you definitely need a new one, and this product is...
      Universal fitConverts harmful engine emissions to less dangerous gases and water vapor
      # 17579400
    • (0 reviews)
      $25.13$20.10
      Mercury Grand Marquis V8 5.0L F Engine VIN Code 1984, 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....
      # 9381490
    • (0 reviews)
      $94.53from $75.62 - $146.90
      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...
      # 898490
    • (0 reviews)
      $209.88from $167.90 - $267.60
      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...
      # 898450
    • (0 reviews)
      $132.48from $105.98 - $230.86
      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...
      # 898479
    • (0 reviews)
      $246.58$197.26
      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.
      # 3146020
    • (0 reviews)
      $390.89$312.71
      Universal Delta Force™ Aluminized Steel Low Profile Oval Tubing Race Muffler by Flowmaster®, Aggressive Sound, 3.50" Dual Inlet / 3.50" Dual Outlet, 2.75 Thick x 11" Wide x 25" Length. The low profile mufflers are Delta Flow™...
      # 898448
    • (1 reviews)
      $111.25from $89.00 - $141.66
      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”...
      # 898456
    • (1 reviews)
      $236.09$188.87
      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...
      # 898465
    • (0 reviews)
      $234.83from $187.86 - $208.84
      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...
      # 23297627
    • (0 reviews)
      $274.15$219.32
      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...
      # 898468
    • (1 reviews)
      $108.85from $87.08 - $108.08
      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...
      # 897054
    • (0 reviews)
      $108.85$87.08
      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...
      # 897079
    • (0 reviews)
      $133.78from $107.02 - $125.92
      Universal 50 Series Delta Flow™ Muffler by Flowmaster®, MODERATE SOUND, 4" Thick x 9.75" Wide x 17" Case Length x 23" Overall Length. The 50 Series Delta Flow mufflers are designed for passenger cars. The sound characteristics...
      # 897086
    • (0 reviews)
      $174.45$139.56
      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...
      # 897156
    • (0 reviews)
      $163.98$131.18
      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...
      # 897052
    • (0 reviews)
      $190.19$152.15
      Universal 70 Series Delta Flow™ Big Block Muffler by Flowmaster®, MILD SOUND, 5" Thick x 10" Wide x 22" Case Length x 28" Overall Length. The 70 Series Big Block II Muffler uses a longer case for increased volume and added...
      # 897109
    • (0 reviews)
      $183.63from $146.90 - $205.66
      Universal Pro Series™ Laminar Flow Muffler by Flowmaster®, MODERATE SOUND. PRO Laminar Flow mufflers have a patented core design that is characterized by efficient exhaust scavenging and minimized drone. They produce a rich, deep...
      # 897161
    • (5 reviews)
      $87.49from $69.99 - $73.44
      Universal Super 10 Series Delta Flow™ Stainless Steel Muffler by Flowmaster®, AGGRESSIVE SOUND, 4" Thick x 9.75" Wide x 5.50" Case Length x 12.50" Overall Length. If you want to be arrested, you should mount this muffler on your...
      # 897126
    • (0 reviews)
      $131.15from $104.92 - $109.49
      Universal Super 40 Series Delta Flow™ Muffler by Flowmaster®, AGGRESSIVE SOUND, 5" Thick x 10" Wide x 13.50" Case Length x 19.50" Overall Length. The Super 40 Series Delta Flow Mufflers are developed from the Top Ten muffler...
      # 897132
    • (3 reviews)
      $104.88from $83.90 - $94.44
      Universal Super 44 Series Delta Flow™ Muffler by Flowmaster®, AGGRESSIVE SOUND, 4" Thick x 9.75" Wide x 13" Case Length x 19" Overall Length. The Super 44 has the deepest, richest, most aggressive muscle tone of all 4” street...
      # 897136
    • (0 reviews)
      $137.73from $110.18 - $178.38
      Universal Super HP-2™ Stainless Steel Performance Muffler by Flowmaster®, 4" Thick x 5" Wide. The new Super HP-2 Series muffler offers the same great performance benefits and moderate tone that you would expect from our laminar...
      # 15943155
    • (0 reviews)
      $99.60from $79.68 - $124.88
      Universal Resonator by Flowmaster®. The resonators are designed for use in conjunction with Flowmaster Mufflers for improved sound reduction and minimize interior resonance.
      # 898502
    • (12 reviews)
      $219.99$175.99
      Universal S-Type™ Stainless Steel Round Muffler by Borla®. Get increased performance and the aggressive sound of power with this Universal S-Type Muffler. This is the same style austenitic stainless steel straight through muffler...
      # 25728287
    • (1 reviews)
      $306.24from $244.99 - $469.99
      Universal XR-1™ Multicore Stainless Steel Race Muffler by Borla®. The Borla XR-1 Multi-Core Muffler was developed on the race track to quiet the most severe engine noise without restricting power. They work so well that they're...
      # 959705
    • (1 reviews)
      $262.49$209.99
      Universal Heavy Duty Stainless Steel Round Muffler by Borla®, 3" Center Inlet / 3" Center Outlet. Get increased performance and the aggressive sound of power with this Heavy Duty Stainless Steel Round Muffler. This muffler includes...
      # 25728296
    • (1 reviews)
      $96.74from $77.39 - $123.90
      Universal CFT Superflow™ Oval Muffler by Gibson®. Get optimum usable power and a deep powerful sound with a Gibson CFT Superflow Muffler. The CFT Superflow has one of the lowest restriction ratings of any muffler on the market,...
      # 2060024
    • (1 reviews)
      $105.50from $84.40 - $262.75
      Universal SFT Superflow™ Round Muffler by Gibson®. Get increased exhaust flow for more power and great sound with a Gibson SFT Superflow Muffler. The SFT Superflow has one of the lowest restriction ratings of any muffler on the...
      # 2060137
    • (0 reviews)
      $194.43$155.54
      Universal Race Muffler by Gibson®. Inspite of the large host of engineers and technicians, Gibson Performance has not lost its commitment to building cost-effective exhaust systems that deliver more performance for less spendings....
      # 26542951



    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.