Need expert help? Reach out to us via live chat MON-SAT, 9AM to 5PM ET, for support. Our specialists are ready to assist you!
Login My Account Icon | Sign Up
0

Please, add your first item to the wishlist

Need expert help? Reach out to us via live chat MON-SAT, 9AM to 5PM ET, for support. Our specialists are ready to assist you!

0

Please, add your first item to the wishlist

Select vehicle to confirm fitment

Spark Plug (Pre-Gap 0.032) (Iridium IX)

PART#: 6637
NGK
Top Deal
Add to My Projects
Spark Plug (Pre-Gap 0.032) (Iridium IX)

$5.99

Select vehicle to confirm fitment

In stock

Need help? Talk to us, or chat with an expert!
Add to My Projects
Interchanges
BrandPart #
NGK6637
Fitments
YearMakeModelSubmodelEngineFuel TypePositionNote
1999Land RoverDiscoverySeries II4.0V8GAS4th digit of VIN: "J"; Gap 0.032"
1999Land RoverDiscoverySD4.0V8GAS4th digit of VIN: "J"; Gap 0.032"
1999MitsubishiEclipseGST2.0L4GASGap 0.032" | Turbocharged;
1999MitsubishiEclipseSpyder GST2.0L4GASGap 0.032" | Turbocharged;
1999MitsubishiEclipseGSX2.0L4GASGap 0.032" | Turbocharged;
1998Land RoverDiscovery50th Anniversary Edition4.0V8GASGap 0.032"
1998Land RoverDiscoveryLE4.0V8GASGap 0.032"
1998Land RoverDiscoveryLSE4.0V8GASGap 0.032"
1998MitsubishiEclipseGSX2.0L4GASGap 0.032" | Turbocharged;
1998MitsubishiEclipseSpyder GST2.0L4GASGap 0.032" | Turbocharged;
1998MitsubishiEclipseGST2.0L4GASGap 0.032" | Turbocharged;
1997Land RoverDiscoverySE74.0V8GASGap 0.032"
1997Land RoverDiscoveryXD4.0V8GASGap 0.032"
1997Land RoverDiscoveryLSE4.0V8GASGap 0.032"
1997Land RoverDiscoverySE4.0V8GASGap 0.032"
1997Land RoverDiscoverySD4.0V8GASGap 0.032"
1997MitsubishiEclipseGST2.0L4GASGap 0.032" | Turbocharged;
1997MitsubishiEclipseGSX2.0L4GASGap 0.032" | Turbocharged;
1997MitsubishiEclipseSpyder GST2.0L4GASGap 0.032" | Turbocharged;
1996Land RoverDiscoverySD4.0V8GASGap 0.032"
1996Land RoverDiscoverySE74.0V8GASGap 0.032"
1996Land RoverDiscoverySE4.0V8GASGap 0.032"
1996MitsubishiEclipseSpyder GST2.0L4GASGap 0.032" | Turbocharged;
1996MitsubishiEclipseGST2.0L4GASGap 0.032" | Turbocharged;
1996MitsubishiEclipseGSX2.0L4GASGap 0.032" | Turbocharged;
1995Porsche928GTS5.4V8GASGap 0.028"
1995Porsche968Base3.0L4GASGap 0.032"
1995Land RoverDiscoveryBase3.9V8GASGap 0.032"
1995Volvo940T2.3L4GASGap 0.028"
1995Volvo940Base2.3L4GASGap 0.028"
1995MitsubishiEclipseGSX2.0L4GASGap 0.032" | Turbocharged;
1995MitsubishiEclipseGST2.0L4GASGap 0.032" | Turbocharged;
1995LotusEspritS4s2.2L4GASGap 0.032"
1995LotusEspritS42.2L4GASGap 0.032"
1994Porsche928GTS5.4V8GASGap 0.028"
1994Porsche968Base3.0L4GASGap 0.032"
1994Land RoverDiscoveryBase3.9V8GASGap 0.032"
1994Volvo940Base2.3L4GASGap 0.028"
1994Volvo940T2.3L4GASGap 0.028"
1994MitsubishiEclipseGST2.0L4GASGap 0.032" | Turbocharged;
1994MitsubishiEclipseGS2.0L4GASGap 0.032" | Turbocharged;
1994MitsubishiEclipseGSX2.0L4GASGap 0.032" | Turbocharged;
1994LotusEspritS42.2L4GASGap 0.032"
1993Porsche928GTS5.4V8GASGap 0.028"
1993Porsche968Base3.0L4GASGap 0.032"
1993Volvo240Base2.3L4GASGap 0.028"
1993Volvo940T2.3L4GASGap 0.028"
1993Volvo940Base2.3L4GASGap 0.028"
1993MitsubishiEclipseGSX2.0L4GASGap 0.032" | Turbocharged;
1993MitsubishiEclipseGS2.0L4GASGap 0.032" | Turbocharged;
1993MitsubishiEclipseGST2.0L4GASGap 0.032" | Turbocharged;
1993LotusEspritTurbo SE2.2L4GASGap 0.032"
1992Porsche911Turbo3.3H6GASGap 0.024"
1992Porsche968Base3.0L4GASGap 0.032"
1992Volvo240GL2.3L4GASGap 0.028"
1992Volvo240Base2.3L4GASGap 0.028"
1992Volvo740Base2.3L4GASGap 0.028"
1992Volvo740T2.3L4GASGap 0.028"
1992Volvo940GL2.3L4GASGap 0.028"
1992Volvo940T2.3L4GASGap 0.028"
1992MitsubishiEclipseGSX2.0L4GASGap 0.032" | Turbocharged;
1992MitsubishiEclipseGST2.0L4GASGap 0.032" | Turbocharged;
1992MitsubishiEclipseGS2.0L4GASGap 0.032" | Turbocharged;
1992MitsubishiGalantGS2.0L4GASGap 0.032" | Engine VIN: U;
1992MitsubishiGalantGSR2.0L4GASGap 0.032" | Engine VIN: U;
1992MitsubishiGalantLS2.0L4GASGap 0.032" | Engine VIN: U;
1992MitsubishiGalantVR-42.0L4GASGap 0.032" | Engine VIN: U;
1992MitsubishiGalantBase2.0L4GASGap 0.032" | Engine VIN: U;
1992MitsubishiGalantGSX2.0L4GASGap 0.032" | Engine VIN: U;
1992LotusEspritTurbo SE2.2L4GASGap 0.032"
1991Porsche911Turbo3.3H6GASGap 0.024"
1991Porsche911Carrera 23.6H6GASGap 0.028"
1991Porsche928Base5.0V8GASGap 0.028"
1991Porsche928GT5.0V8GASGap 0.028"
1991Porsche944S23.0L4GASGap 0.028"
1991Volvo240Base2.3L4GASGap 0.028"
1991Volvo240SE2.3L4GASGap 0.028"
1991Volvo740Base2.3L4GASGap 0.028"
1991Volvo740T2.3L4GASGap 0.028"
1991Volvo780Base2.3L4GASGap 0.028"
1991Volvo940T2.3L4GASGap 0.028"
1991Volvo940SE2.3L4GASGap 0.028"
1991Volvo940GLE2.3L4GASGap 0.028"
1991MitsubishiEclipseGS2.0L4GASGap 0.032" | Turbocharged;
1991MitsubishiEclipseGST2.0L4GASGap 0.032" | Turbocharged;
1991MitsubishiEclipseGSX2.0L4GASGap 0.032" | Turbocharged;
1991MitsubishiGalantVR-42.0L4GASGap 0.032" | Turbocharged;
1990Porsche928Base5.0V8GASGap 0.028"
1990Porsche928GT5.0V8GASGap 0.028"
1990Porsche944S23.0L4GASGap 0.028"
1990Volvo240Base2.3L4GASGap 0.028"
1990Volvo240DL2.3L4GASGap 0.028"
1990Volvo740Base2.3L4GASGap 0.028"
1990Volvo740GLE2.3L4GASGap 0.028"
1990Volvo740GL2.3L4GASGap 0.028"
1990Volvo780Base2.3L4GASGap 0.028"
1990MitsubishiEclipseGST2.0L4GASGap 0.032" | Turbocharged;
1990MitsubishiEclipseGS2.0L4GASGap 0.032" | Turbocharged;
1990MitsubishiEclipseGSX2.0L4GASGap 0.032" | Turbocharged;
1989Porsche911Carrera3.2H6GASGap 0.028"
1989Porsche911Speedster3.2H6GASGap 0.028"
1989Porsche928S45.0V8GASGap 0.028"
1989Porsche944Turbo2.5L4GASGap 0.028"
1989Porsche944Base2.7L4GASGap 0.028"
1989Alfa RomeoMilanoPlatinum2.5V6GASGap 0.025"
1989Alfa RomeoMilanoGold2.5V6GASGap 0.025"
1989Volvo244GL2.3L4GASGap 0.028"
1989Volvo244DL2.3L4GASGap 0.028"
1989Volvo245DL2.3L4GASGap 0.028"
1989Volvo245GL2.3L4GASGap 0.028"
1989Volvo740GLE2.3L4GASGap 0.028"
1989Volvo740GL2.3L4GASGap 0.028"
1989Volvo740Base2.3L4GASGap 0.028"
1989Volvo780Base2.3L4GASGap 0.028"
1989NissanD21Base2.4L4GASGap 0.032"; Intake
1989NissanD21E2.4L4GASGap 0.032"; Intake
1989NissanD21XE2.4L4GASGap 0.032"; Intake
1989MitsubishiMirageTurbo1.6L4GASGap 0.032"
1988Porsche911Carrera3.2H6GASGap 0.028"
1988Porsche924S2.5L4GASGap 0.028"
1988Porsche928S45.0V8GASGap 0.028"
1988Porsche944Turbo2.5L4GASGap 0.028"
1988Porsche944Base2.5L4GASGap 0.028"
1988Porsche944S2.5L4GASGap 0.028"
1988Porsche944Turbo S2.5L4GASGap 0.028"
1988Alfa RomeoMilanoPlatinum2.5V6GASGap 0.025"
1988Alfa RomeoMilanoGold2.5V6GASGap 0.025"
1988Volvo244DL2.3L4GASGap 0.028"
1988Volvo244GL2.3L4GASGap 0.028"
1988Volvo245GL2.3L4GASGap 0.028"
1988Volvo245DL2.3L4GASGap 0.028"
1988Volvo740GLE2.3L4GASGap 0.028"
1988NissanD21E2.4L4GASGap 0.032"; Intake
1988NissanD21XE2.4L4GASGap 0.032"; Intake
1988NissanD21Base2.4L4GASGap 0.032"; Intake
1988Audi5000CS2.2L5GASGap 0.032"
1988LotusEspritTurbo2.2L4GASGap 0.035" | Turbocharged;
1988LotusEspritBase2.2L4GASGap 0.025" | Naturally Aspirated;
1987Porsche911Carrera3.2H6GASGap 0.028"
1987Porsche924S2.5L4GASGap 0.028"
1987Porsche928S45.0V8GASGap 0.028"
1987Porsche944Base2.5L4GASGap 0.028"
1987Porsche944Turbo2.5L4GASGap 0.028"
1987Porsche944S2.5L4GASGap 0.028"
1987Alfa RomeoMilanoGold2.5V6GASGap 0.025"
1987Alfa RomeoMilanoPlatinum2.5V6GASGap 0.025"
1987Alfa RomeoMilanoSilver2.5V6GASGap 0.025"
1987Volvo244GL2.3L4GASGap 0.028"
1987Volvo244DL2.3L4GASGap 0.028"
1987Volvo245DL2.3L4GASGap 0.028"
1987Volvo245GL2.3L4GASGap 0.028"
1987Volvo740GLE2.3L4GASGap 0.028"
1987Volvo760GLE2.3L4GASGap 0.028"
1987NissanD21Base2.4L4GASGap 0.032"; Intake
1987NissanD21XE2.4L4GASGap 0.032"; Intake
1987NissanD21E2.4L4GASGap 0.032"; Intake
1987NissanPathfinderE2.4L4GASGap 0.032"; Intake
1987AudiCoupeGT2.3L5GASGap 0.028"
1987Audi4000 QuattroCS2.2L5GASGap 0.032"
1987Audi5000S2.2L5GASGap 0.028" | Engine VIN: B; Naturally Aspirated;
1987Audi5000CS2.2L5GASGap 0.032" | Engine VIN: D; Turbocharged;
1987VolkswagenQuantumSyncro2.2L5GASGap 0.032" | Engine Code: JT;
1987VolkswagenQuantumGL2.2L5GASGap 0.032" | Engine Code: JT;
1987VolkswagenQuantumBase2.2L5GASGap 0.032" | Engine Code: JT;
1987Mazda626GT2.0L4GASGap 0.032" | Turbocharged;
1987LotusEspritTurbo2.2L4GASGap 0.035" | Turbocharged;
1987LotusEspritS32.2L4GASGap 0.025" | Naturally Aspirated;
1986Porsche911Carrera3.2H6GASGap 0.028"
1986Porsche928S5.0V8GASGap 0.028"
1986Porsche944Turbo2.5L4GASGap 0.028"
1986Porsche944Base2.5L4GASGap 0.028"
1986Alfa RomeoGTV-62.52.5V6GASGap 0.025"
1986Volvo244GL2.3L4GASGap 0.028"
1986Volvo244DL2.3L4GASGap 0.028"
1986Volvo245DL2.3L4GASGap 0.028"
1986Volvo245GL2.3L4GASGap 0.028"
1986Volvo740GLE2.3L4GASGap 0.028"
1986Saab900Turbo2.0L4GASGap 0.028" | Engine Code: B202I;
1986Saab900SPG2.0L4GASGap 0.028" | Engine Code: B202I;
1986Saab900S2.0L4GASGap 0.028" | Engine Code: B202I;
1986Saab900Base2.0L4GASGap 0.028" | Engine Code: B202I;
1986NissanD21E2.4L4GASGap 0.032"; Intake
1986NissanD21XE2.4L4GASGap 0.032"; Intake
1986NissanD21Base2.4L4GASGap 0.032"; Intake
1986Nissan720Base2.0L4GASGap 0.032"; Intake
1986Nissan720Sport Truck2.4L4GASGap 0.032"; Intake
1986Nissan720Base2.4L4GASGap 0.032"; Intake
1986Nissan720Deluxe2.4L4GASGap 0.032"; Intake
1986Audi4000 QuattroCS2.2L5GASGap 0.032"
1986Audi5000CS2.2L5GASGap 0.032" | Turbocharged;
1986Audi5000S2.2L5GASGap 0.028" | Naturally Aspirated;
1986Audi5000 QuattroCS2.2L5GASGap 0.032" | Engine VIN: D;
1986VolkswagenQuantumSyncro2.2L5GASGap 0.032" | Engine Code: JT;
1986VolkswagenQuantumBase2.2L5GASGap 0.032" | Engine Code: JT;
1986VolkswagenQuantumGL2.2L5GASGap 0.032" | Engine Code: JT;
1986MaseratiQuattroporteBase4.9V8GASGap 0.028"
1986Mazda626GT2.0L4GASGap 0.032" | Turbocharged;
1986LotusEspritTurbo2.2L4GASGap 0.035"
1986LotusEspritS32.2L4GASGap 0.035"
1985Porsche911Carrera3.2H6GASGap 0.028"
1985Porsche928S5.0V8GASGap 0.028"
1985Porsche944Base2.5L4GASGap 0.028"
1985Alfa RomeoGTV-62.52.5V6GASGap 0.025"
1985Volvo244GL2.3L4GASGap 0.028"
1985Volvo244Turbo2.1L4GASGap 0.028"
1985Volvo244DL2.3L4GASGap 0.028"
1985Volvo245Base2.3L4GASGap 0.028"
1985Volvo245Base2.1L4GASGap 0.028"
1985Volvo740GLE2.3L4GASGap 0.028"
1985Volvo745GLE2.3L4GASGap 0.028"
1985Nissan720Deluxe2.4L4GASGap 0.032"; Intake
1985Nissan720Base2.4L4GASGap 0.032"; Intake
1985Nissan720Sport Truck2.4L4GASGap 0.032"; Intake
1985Nissan720Base2.0L4GASGap 0.032"; Intake
1985Audi5000S2.2L5GASGap 0.028" | Naturally Aspirated;
1985MaseratiQuattroporteBase4.9V8GASGap 0.028"
1985LotusEspritS32.2L4GASGap 0.035"
1985LotusEspritTurbo2.2L4GASGap 0.035"
1984Porsche911Carrera3.2H6GASGap 0.028"
1984Porsche928S4.7V8GASGap 0.028"
1984Alfa RomeoGTV-62.52.5V6GASGap 0.025"
1984Volvo242GLT2.1L4GASGap 0.028"
1984Volvo242DL2.3L4GASGap 0.028"
1984Volvo244Base2.1L4GASGap 0.028"
1984Volvo244GL2.3L4GASGap 0.028"
1984Volvo244DL2.3L4GASGap 0.028"
1984Volvo245Base2.3L4GASGap 0.028"
1984Volvo245Base2.1L4GASGap 0.028"
1984Nissan720Base2.0L4GASGap 0.032"; Intake
1984Nissan720Deluxe2.4L4GASGap 0.032"; Intake
1984Nissan720Base2.4L4GASGap 0.032"; Intake
1984AudiCoupeBase2.2L5GASGap 0.028"
1984VolkswagenJettaGL1.7L4GASGap 0.028"
1984VolkswagenJettaBase1.7L4GASGap 0.028"
1984VolkswagenJettaGLI1.7L4GASGap 0.028"
1984VolkswagenQuantumGL2.2L5GASGap 0.028"
1984VolkswagenQuantumWolfsburg Edition2.2L5GASGap 0.028"
1984VolkswagenRabbitL1.7L4GASGap 0.028"
1984MaseratiQuattroporteBase4.9V8GASGap 0.028"
1984LotusEspritTurbo2.2L4GASGap 0.035"
1984LotusEspritBase2.2L4GASGap 0.035"
1983Porsche928S4.7V8GASGap 0.028"
1983FiatX-1/9Base1.5L4GASGap 0.030"
1983Alfa RomeoGTV-62.52.5V6GASGap 0.025"
1983Volvo242DL2.3L4GASGap 0.028"
1983Volvo242GLT2.1L4GASGap 0.028"
1983Volvo244GLT2.1L4GASGap 0.028"
1983Volvo244DL2.3L4GASGap 0.028"
1983Volvo245GLT2.1L4GASGap 0.028"
1983Volvo245DL2.3L4GASGap 0.028"
Product info

The NGK spark plug is designed to deliver reliable and consistent ignition that allows your engine to reach its peak performance in all conditions of use. With NGK, you’re getting improved spark plug lifespan, better combustion, optimized fuel economy, as well as fewer emissions.

The 6637 spark plug is specifically built to meet the needs of Alfa Romeo, Aston Martin, Audi, Austin, Austin Healey, Bertone, BMW, Buick, Citroen, Daewoo, Dodge, Fiat, Honda, Hyundai, Jaguar, Jensen, Lada, Lancia, Land Rover, Lotus, Maserati, Mazda, Mercedes-Benz, MG, Mitsubishi, Morgan, Morris, Nissan, Peugeot, Plymouth, Porsche, Renault, Saab, Subaru, Toyota, Triumph, Volkswagen, Volvo vehicles, ensuring optimal fit and performance characteristics that perfectly match your engine’s requirements.

Using quality replacement spark plugs is a good way to keep your engine running smoothly. NGK offers that, and much more! Over the years, they’ve become one of the leading authorities in the world of ignition systems with a strong track record of innovation. As a result, many carmakers from all around the world have chosen this brand as OEM for their engines. Give your car the NGK makeover it needs, and enjoy years of care-free driving!

About NGK

NGK is a company with over 80 years of experience in the automotive industry. The production of the first NGK spark plugs began in 1937.

However, it was the manufacturing of copper-cored wide range spark plugs in 1958 that helped the company become a leading brand in the automotive industry. The company headquarters is located in Nagoya, Japan.

With the success of NGK products like spark plugs, glow plugs, and oxygen sensors, the company gained a strong global presence.

NGK currently has 35 production plants worldwide and employs more than 10,400 people.

The company currently has facilities in countries such as South Africa, South Korea, Japan, Australia, China, India, France, United States, and United Kingdom.

In the beginning, the company supplied a majority of its products to Japanese automakers. Today, drivers across the globe use NGK spark plugs, which are compatible with a variety of vehicle makes.

In fact, almost every petrol engine available on the market can use NGK spark plugs.

The company produces more than a thousand different types of spark plugs, which makes it easy to find the right fit for your engine.

There are three different NGK innovation labs where engineers search for new ways to improve existing products and make new ones.

Thanks to the efforts of these labs, NGK was able to venture into the medical industry.

Despite being one of the largest manufacturers of spark plugs on the planet, NGK is always thinking about the next.

A few years ago, the company announced plans to gradually shift its focus towards solid-state batteries because electric vehicles may make spark plugs obsolete.

Specifications
Center Electrode Core MaterialCopper Core
Center Electrode Tip MaterialIridium
Ground ConfigurationStandard
Ground Electrode Core MaterialNickel Core
Ground Electrode Quantity1
Ground Electrode Tip DesignTaper Cut
Hex Size13/16"
Insulator Height55.00
Manufacturer Heat Range6
Pre-Gap Size0.032
Reach0.75
Resistance5000
Seat TypeGasket
Thread Diameter0.551
Warranty
We offer a 2-year warranty on all parts that we sell. If the part fails within 2 years of purchase, please contact us for instructions to replace it. The warranty does not cover normal wear and tear or improper installation. On many parts, we also offer Extend product protection, which is a way to add up to 3 additional years for 5 total years of worry free coverage. Select your preferred term length and you're covered!
Delivery & Returns

Delivery Info

Newparts.com is your go to store for all parts and accessories at the best price and delivered quickly. Every order we ship receives a tracking number so that you can watch it all the way until it reaches your door. We only ship using the major shipping carriers like FedEx, UPS and USPS to ensure quick and safe delivery of your new car parts order.

Returns Info

Newparts.com offers a thirty (30) day return for refund for all items purchased through Newparts.com. To qualify for return and refund, all items must be new and in their original manufacturers box. To initiate a return, please contact our customer service. This information is only a summary. Complete shipping and return policy information can be found in our web site policies.

✕

Free shipping Icon

FREE SHIPPING

Available on all kits, sets & Bison performance products