1991 Ford Mustang Spark Plug

Part Number: 5478-09083083

Notes: G-Power Spark Plug -- Dual Plug; 8 Required; Gap 0.044"

Features:

• NGK G-Power Platinum spark plugs are an economical upgrade option from traditional spark plugs. Fine wire platinum center electrode provides excellent performance and fuel efficiency.

Part Number: 5478-09083087

Notes: G-Power Spark Plug -- Gap 0.054"

Features:

• NGK G-Power Platinum spark plugs are an economical upgrade option from traditional spark plugs. Fine wire platinum center electrode provides excellent performance and fuel efficiency.

Part Number: 5478-05051270

Notes: Iridium IX Spark Plug -- Dual Plug; 8 Required; Gap 0.044"

Features:

• NGK Iridium IX spark plugs are designed specifically for the performance enthusiast. Iridium IX spark plugs offer extreme ignitibility, improved throttle response and superior anti-fouling.

Part Number: 5478-05292023

Notes: Iridium IX Spark Plug -- Gap 0.054"

Features:

• NGK Iridium IX spark plugs are designed specifically for the performance enthusiast. Iridium IX spark plugs offer extreme ignitibility, improved throttle response and superior anti-fouling.

Part Number: 5478-09134488

Notes: Laser Iridium Spark Plug -- Dual Plug; 8 Required; Gap 0.044"

Features:

• Often specified as original equipment, NGK Laser Iridium spark plugs are the best combination of performance and longevity. Iridium tip is six (6) times harder than platinum providing the strongest ignitability and the longest life possible.

Part Number: 5478-09083131

Notes: Laser Platinum Spark Plug -- Dual Plug; 8 Required; Gap 0.044"

Features:

• Orignal equipment manufacturer approved NGK Laser Platinum spark plugs provide high ignitibility and longer service life compared to conventional spark plugs. Dual-platinum surfaces on most Laser Platinum spark plugs ensure a slower wear rate.

Part Number: 5478-03343874

Notes: V-Power Spark Plug -- Dual Plug; 8 Required; Gap 0.044"; OE Equivalent Design; 30,000 mi OE Manufacturer Recommended Service Interval

Features:

• Original equipment manufacturer approved and an excellent upgrade from standard spark plugs, NGK V-Power spark plugs feature a special V-Groove center electrode and concave ground electrode to increase ignitibility.

Part Number: 5478-03344075

Notes: V-Power Spark Plug -- Gap 0.054"; 30,000 mi OE Manufacturer Recommended Service Interval

Features:

• Original equipment manufacturer approved and an excellent upgrade from standard spark plugs, NGK V-Power spark plugs feature a special V-Groove center electrode and concave ground electrode to increase ignitibility.

Part Number: 5478-03651039

Notes: Copper Resistor Spark Plug -- .054" / 1.4mm; OE Style

Features:

• Autolite Copper Core plugs are designed to meet or exceed OES design requirements.

Part Number: 5478-03651098

Notes: Copper Resistor Spark Plug -- OE half thread design replaced by full thread design; .044" / 1.1mm; OE Style; with Dual Spark Plugs

Features:

• Autolite Copper Core plugs are designed to meet or exceed OES design requirements.

Part Number: 5478-03651030

Notes: Copper Resistor Spark Plug -- Replaces OE Half Thread Design; .044" / 1.1mm; OE Style; with Dual Spark Plugs

Features:

• Autolite Copper Core plugs are designed to meet or exceed OES design requirements.

Part Number: 5478-09183055

Notes: Double Platinum Spark Plug -- .054"/1.4mm

Features:

• Autolite Double Platinum plugs feature platinum-to-platinum firing which virtually eliminates gap erosion, reduces misfires and increases durability of the plug.

Part Number: 5478-09183049

Notes: Double Platinum Spark Plug -- Replaces OE Half Thread Design; .044"/1.1mm; with Dual Spark Plugs

Features:

• Autolite Double Platinum plugs feature platinum-to-platinum firing which virtually eliminates gap erosion, reduces misfires and increases durability of the plug.

Part Number: 5478-03651176

Notes: Iridium Spark Plug -- Iridium Enhanced Center Electrode. Proprietary V-trimmed Platinum side wire. 0.6mm finewire design.; .054" / 1.4mm

Features:

• Our best spark plug! Autolite Iridium XP spark plugs feature an iridium-enhanced 0.6mm finewire design and patented platinum sidewire technology to provide better overall durability and a more focused ignition.

Part Number: 5478-09183092

Notes: Iridium Spark Plug -- Iridium Enhanced Center Electrode. Proprietary V-trimmed Platinum side wire. 0.6mm finewire design.; Replaces OE Half Thread Design; .044"/1.1mm; with Dual Spark Plugs

Features:

• Our best spark plug! Autolite Iridium XP spark plugs feature an iridium-enhanced 0.6mm finewire design and patented platinum sidewire technology to provide better overall durability and a more focused ignition.

Part Number: 5478-03651111

Notes: Platinum Spark Plug -- .054" / 1.4mm

Features:

• Autolite Platinum plugs provide a center wire platinum firing tip which provides reduced gap erosion, fewer misfires, better performance and increased durability.

Part Number: 5478-03651106

Notes: Platinum Spark Plug -- Replaces OE Half Thread Design; .044" / 1.1mm; with Dual Spark Plugs

Features:

• Autolite Platinum plugs provide a center wire platinum firing tip which provides reduced gap erosion, fewer misfires, better performance and increased durability.

Part Number: 5478-09006498

Notes: Professional Conventional -- New; Gap .044 Requires 2 plugs per cylinder

Part Number: 5478-09006491

Notes: Professional Conventional -- New; Gap .054

Part Number: 5478-09006452

Notes: Professional Double Platinum -- New; 2 PLUGS/CYLINDER; Gap .044

Part Number: 5478-09006455

Notes: Professional Double Platinum -- New; Gap .054

Part Number: 5478-05005375

Notes: Professional RAPIDFIRE -- New; 2 PLUGS/CYLINDER; Gap .044

Part Number: 5478-05005918

Notes: Professional RAPIDFIRE -- New; Gap .054

Part Number: 5478-05212362

Notes: Nickel -- Gap 0.044 in; Original equipment is nickel; with Dual Spark Plugs

Features:

• Heavy-duty yttrium enhanced nickel-copper center electrode ensures superior reliability and durability for up to 50% longer performance life vs. standard copper plugs
• Copper core provides broader heat range to resist pre-ignition and fouling
• Nickel-plated rolled threads provide superior resistance to corrosion and do not require anti-seize - saving time
• Angled, ribbed insulator design prevents misfire due to flash-over
• Metal glass fused resistor maximizes interference suppression
• Bosch Super Plus, with a heavy-duty yttrium-enhanced copper core center electrode, is the longest lasting copper core spark plug on the market.

Part Number: 5478-05276430

Notes: Nickel -- Gap 0.054 in; Original equipment is nickel

Features:

• Heavy-duty yttrium enhanced nickel-copper center electrode ensures superior reliability and durability for up to 50% longer performance life vs. standard copper plugs
• Copper core provides broader heat range to resist pre-ignition and fouling
• Nickel-plated rolled threads provide superior resistance to corrosion and do not require anti-seize - saving time
• Angled, ribbed insulator design prevents misfire due to flash-over
• Metal glass fused resistor maximizes interference suppression
• Bosch Super Plus, with a heavy-duty yttrium-enhanced copper core center electrode, is the longest lasting copper core spark plug on the market.

Part Number: 5478-05252116

Notes: OE Fine Wire Double Iridium -- Do Not Gap, Gap is Preset; Original equipment is nickel

Features:

• Double Iridium electrodes - iridium firing pin and iridium ground electrode inlay offer higher performance and 4 times longer life compared to standard copper spark plugs
• OE Fine Wire design requires up to 24% less voltage to ignite
• 360 degree continuous laser welding increases durability for increased life
• Copper core provides broader heat range to resist pre-ignition and fouling
• Pre-gapped and nickel plated threads allow for quick installation without adjusting the gap or applying anti-seize
• Tapered ground electrode allows for better ignition throughout the life of the spark plug
• Bosch OE Fine Wire Iridium. The only iridium spark plug line engineered for both High Performance and Long Life.

Part Number: 5478-05250276

Notes: OE Fine Wire Double Iridium -- Do Not Gap, Gap is Preset; Original equipment is nickel; with Dual Spark Plugs

Features:

• Double Iridium electrodes - iridium firing pin and iridium ground electrode inlay offer higher performance and 4 times longer life compared to standard copper spark plugs
• OE Fine Wire design requires up to 24% less voltage to ignite
• 360 degree continuous laser welding increases durability for increased life
• Copper core provides broader heat range to resist pre-ignition and fouling
• Pre-gapped and nickel plated threads allow for quick installation without adjusting the gap or applying anti-seize
• Tapered ground electrode allows for better ignition throughout the life of the spark plug
• Bosch OE Fine Wire Iridium. The only iridium spark plug line engineered for both High Performance and Long Life.

Part Number: 5478-09021065

Notes: OE Fine Wire Double Platinum -- Do Not Gap, Gap is Preset; Original equipment is nickel; with Dual Spark Plugs

Features:

• Platinum on the center electrode pin and laser welded platinum inlay ground electrode provide three times longer life than conventional copper spark plugs
• OE Fine Wire design requires up to 24% less voltage to ignite
• 360 degree continuous laser welding increases durability for increased life
• Copper core provides broader heat range to resist pre-ignition and fouling
• Pre-gapped and nickel plated threads allow for quick installation without adjusting the gap or applying anti-seize
• BOSCH OE Fine Wire Double Platinum utilize a platinum tip on both the center and ground electrodes to provide Long Life

Part Number: 5478-05252090

Notes: OE Fine Wire Platinum -- Do Not Gap, Gap is Preset; Original equipment is nickel

Features:

• OE Fine Wire design requires up to 24% less voltage to ignite
• Pre-gapped and nickel plated threads allow for quick installation without adjusting the gap or applying anti-seize
• Tapered ground electrode allows for better ignition throughout the life of the spark plug
• BOSCH OE Fine Wire Platinum deliver improved ignitability and fuel efficiency, and are an economical upgrade from conventional copper core spark plugs

Part Number: 5478-05638779

Notes: OE Fine Wire Platinum -- Do Not Gap, Gap is Preset; Original equipment is nickel; with Dual Spark Plugs

Features:

• OE Fine Wire design requires up to 24% less voltage to ignite
• Pre-gapped and nickel plated threads allow for quick installation without adjusting the gap or applying anti-seize
• Tapered ground electrode allows for better ignition throughout the life of the spark plug
• BOSCH OE Fine Wire Platinum deliver improved ignitability and fuel efficiency, and are an economical upgrade from conventional copper core spark plugs

Part Number: 5478-05120679

Notes: PLATINUM

Part Number: 5478-09020456

Notes: Platinum Plus -- Gap 0.054 in

Part Number: 5478-05310676

Notes: Platinum+2 -- Do Not Gap, Gap is Preset

Part Number: 5478-05527784

Notes: Platinum+2 -- Do Not Gap, Gap is Preset

Part Number: 5478-05021003

Notes: Platinum+4 -- Do Not Gap, Gap is Preset

Features:

• Revolutionary surface air gap firing technology featuring four yttrium-enhanced ground electrodes delivers the longest, most powerful spark for ultimate engine performance
• Four yttrium-enhanced ground electrodes provide optimum access to the air/fuel mixture for the most efficient combustion, plus the yttrium alloy ground electrodes reduce gap wear and oxidation for extended performance life
• Electrode gap is factory set to provide ease of installation - never requires adjustment
• Never requires gapping,the electrode gap is factory-set and never requires adjustment
• Provides ease of installation - never requires adjustment

Part Number: 5478-05244466

Notes: SUPER

Part Number: 5478-05343289

Notes: Spark Plug

Features:

• More Horsepower
• Improved Fuel Efficiency
• Reduced Engine Emissions
• Longer Engine Life
• Better Conductive Heat Transfer
• Easier starts in all weather conditions

Part Number: 5478-05343295

Notes: Spark Plug -- Req. 2 plugs per cylinder

Features:

• More Horsepower
• Improved Fuel Efficiency
• Reduced Engine Emissions
• Longer Engine Life
• Better Conductive Heat Transfer
• Easier starts in all weather conditions

Part Number: W0133-1953823

Notes: OE Copper Core

Part Number: W0133-2621753

Notes: OE Copper Core

Part Number: W0133-2762320

Notes: OE Copper Core

Part Number: W0133-1857686

Notes: OE Copper Core

Part Number: 5478-05048470

Notes: Platinum Spark Plug -- Gap: .044; Type - Alternative Plug; Dual Plug; Plug Material: Platinum

Part Number: 5478-05048477

Notes: Platinum Spark Plug -- Gap: .054; Type - Alternative Plug; Plug Material: Platinum

Part Number: 5478-05701241

Notes: Spark Plug -- Type - Standard Service Plug; Gap: .044; Dual Plug; Plug Material: Copper; -447

Part Number: 5478-05048451

Notes: Spark Plug -- Type - Standard Service Plug; Gap: .044; Dual Plug; Plug Material: Copper; -447-A

Part Number: 5478-05683961

Notes: Spark Plug -- Type - Standard Service Plug; Gap: .054; Plug Material: Copper; -450

Part Number: 5478-05267367

Notes: Champion Iridium -- Plug Type RS12WYPB4; 2 PLUGS/CYLINDER; Gap .044

Features:

• Champion Iridium

Part Number: 5478-05027492

Notes: Copper Plus -- Plug Type RS12YC; 2 PLUGS/CYLINDER; Gap .044; OE Type

Features:

• Champion Copper Plus

Part Number: 5478-05027447

Notes: Copper Plus -- Plug Type RV15YC4; Gap .054; OE Type

Features:

• Champion Copper Plus

Part Number: 5478-05027542

Notes: Double Platinum Power -- Plug Type RS10PYPB5; 2 PLUGS/CYLINDER; Gap .044

Features:

• Champion Double Platinum

Part Number: 5478-05027532

Notes: Double Platinum Power -- Plug Type RV17PMP4; Gap .054

Features:

• Champion Double Platinum

Part Number: 5478-05027482

Notes: Platinum Power -- Plug Type RS10PYC; 2 PLUGS/CYLINDER; Gap .044

Features:

• Champion Platinum Power

Part Number: 5478-05027460

Notes: Platinum Power -- Plug Type RV17PMC4; Gap .054

Features:

• Champion Platinum Power

Part Number: 5478-05829154

Notes: Iridium Long Life -- Gap 0.044; Qty 2 Per Cyl.; Iridium Long Life - Patented Iridium Alloy Plug (90% Iridium) with Platinum Ground Strap

Part Number: 5478-05169633

Notes: Iridium Power -- Gap 0.044; Iridium Power - Performance Upgrade with Worlds Smallest Center Electrode (0.4 mm Dia.) & Tapered Tip Patented U-Groove Design & Patented Iridium Alloy (90% Iridium)

Part Number: 5478-05169631

Notes: Iridium Power -- Gap 0.044; Qty 2 Per Cyl.; Iridium Power - Performance Upgrade with Worlds Smallest Center Electrode (0.4 mm Dia.) & Tapered Tip Patented U-Groove Design & Patented Iridium Alloy (90% Iridium)

Part Number: 5478-05445068

Notes: Iridium TT -- Gap 0.040; Iridium TT - Ultimate Endurance and Power, 0.4mm Iridium and 0.7mm Platinum Twin-Tip Technology

Part Number: 5478-05445067

Notes: Iridium TT -- Gap 0.040; Qty 2 Per Cyl.; Iridium TT - Ultimate Endurance and Power, 0.4mm Iridium and 0.7mm Platinum Twin-Tip Technology

Part Number: 5478-05169543

Notes: Platinum TT -- Gap 0.040; Platinum TT - Twin-Tip Technology Design with Platinum Center Electrode and Titanium Enhanced Ground Strap

Part Number: 5478-05169546

Notes: Platinum TT -- Gap 0.040; Qty 2 Per Cyl.; Platinum TT - Twin-Tip Technology Design with Platinum Center Electrode and Titanium Enhanced Ground Strap

Part Number: W0133-1642105

Notes: U-Groove

Features:

• 100 percent pre-fired to ensure reliable operation
• Patented U-Grove ground electrode
• Bonded; center electrode and insulator for a gas-tight seal
• Copper core center electrode for superior thermal conductivity
• Unique five-rib insulator reduces flashover
• Patented U-groove ground electrode design fires leaner mixtures than conventional plugs
• Precision machine-rolled threads reduce seizing and cross-threading in delicate aluminum heads
• Wide range of part numbers for t

Part Number: 5478-05052091

Notes: U-Groove Conventional -- Gap 0.032; Qty 2 Per Cyl.; O.E. Recommended Resistor Plug with Patented U-Groove Design

Features:

• T20EPR-U
• Increases engine performance and throttle response
• Efficient fuel consumption
• Improved cold-starting
• Stable combustion during idling

Part Number: 5478-05052087

Notes: U-Groove Conventional -- Gap 0.035; O.E. Recommended Resistor Plug with Patented U-Groove Design

Features:

• T16PR-U
• Increases engine performance and throttle response
• Efficient fuel consumption
• Improved cold-starting
• Stable combustion during idling