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| Attribute | Value |
|---|---|
| Center Electrode Core Material | Copper |
| Center Electrode Design | Fine Wire |
| Center Electrode Insulator Tip Projection | 0.14, 3.5 |
| Center Electrode Projection | Mid Projection |
| Center Electrode Tip Material | Iridium |
| Electrical Terminal Type | Cup |
| Grade Type | Performance |
| Ground Configuration | J-gap |
| Ground Electrode Core Material | Copper |
| Ground Electrode Quantity | 1 |
| Ground Electrode Tip Design | Projected Square Platinum Electrode (pspe) - High Ignitability |
| Ground Electrode Tip Material | Platinum |
| Hex Size | 14mm Bi-hex |
| Insulator Height | 2.01, 51.0 |
| Insulator Material | Ceramic |
| Material Grade | Iridium Platinum |
| Part Number | Silkgr9a7eg |
| Pre Gap Size | .028, 0.7 |
| Reach | 1.043, 26.5 |
| Resistance | 5000.0 |
| Resistor Type | Yes |
| Seat Type | Flat |
| Service Number | Silkgr9a7eg |
| Short Style Spark Plug | No |
| Skirt | No |
| Skirt Length | 0.0 |
| Stock Number | 91731 |
| Thread Diameter | 0.472, 12.0 |
| Washer Included | Yes |
| Washer Type | Crush |
This part fits the following vehicles:
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| 25 Years | Convertible | 2021 - 2022 | H6 4.0L | RWD Manual & Automatic Dual Clutch |
| Base | Convertible | 2017 - 2024 | H4 2.0L Turbo | RWD Manual & Automatic Dual Clutch |
| GTS | Convertible | 2018 - 2020 | H4 2.5L Turbo | RWD Manual & Automatic Dual Clutch |
| GTS 4.0 | Convertible | 2021 - 2024 | H6 4.0L | RWD Manual & Automatic Dual Clutch |
| S | Convertible | 2017 - 2024 | H4 2.5L Turbo | RWD Manual & Automatic Dual Clutch |
| Style Edition | Convertible | 2024 | H4 2.0L Turbo | RWD Manual & Automatic Dual Clutch |
| T | Convertible | 2020 - 2023 | H4 2.0L Turbo | RWD Manual & Automatic Dual Clutch |
| SubmodelSUB- MODEL |
Body Style | Years | Engine | Attributes |
|---|---|---|---|---|
| Base | Coupe | 2017 - 2021 | H4 2.0L Turbo | RWD Manual & Automatic Dual Clutch |
| Base | Hatchback | 2017 - 2024 | H4 2.0L Turbo | RWD Manual & Automatic Dual Clutch |
| GT4 | Coupe | 2021 - 2024 | H6 4.0L | RWD Manual |
| GT4 | Hatchback | 2021 - 2023 | H6 4.0L | RWD Automatic Dual Clutch |
| GT4 | Hatchback | 2020 - 2023 | H6 4.0L | RWD Manual |
| GT4 RS | Coupe | 2022 - 2024 | H6 4.0L | RWD Automatic Dual Clutch |
| GT4 RS | Hatchback | 2022 - 2024 | H6 4.0L | RWD Automatic Dual Clutch |
| GTS | Coupe | 2019 - 2020 | H4 2.5L Turbo | RWD Manual & Automatic Dual Clutch |
| GTS | Hatchback | 2018 - 2019 | H4 2.5L Turbo | RWD Manual & Automatic Dual Clutch |
| GTS 4.0 | Coupe | 2021 - 2024 | H6 4.0L | RWD Automatic Dual Clutch |
| GTS 4.0 | Hatchback | 2021 - 2024 | H6 4.0L | RWD Manual & Automatic Dual Clutch |
| S | Coupe | 2017 - 2021 | H4 2.5L Turbo | RWD Manual & Automatic Dual Clutch |
| S | Hatchback | 2017 - 2024 | H4 2.5L Turbo | RWD Manual & Automatic Dual Clutch |
| Style | Coupe | 2024 | H4 2.0L Turbo | RWD Automatic Dual Clutch |
| Style Edition | Hatchback | 2024 | H4 2.0L Turbo | RWD Manual & Automatic Dual Clutch |
| T | Coupe | 2021 - 2023 | H4 2.0L Turbo | RWD Automatic Dual Clutch |
| T | Hatchback | 2020 - 2023 | H4 2.0L Turbo | RWD Manual & Automatic Dual Clutch |
We offer fast, reliable shipping on all orders:
This part comes with a limited lifetime warranty. Warranty begins on the original purchase date.
Warranty does NOT cover:
We want you to be 100% satisfied with your purchase. That's why we offer:
| Brand | Part Number |
|---|---|
| NGK | 91731 |
Fits Years: 2017 2018 2019 2020 2021 2022 2023 2024
Fits Models: 718 Boxster, 718 Cayman
In operation since 2007. Trusted by over a million DIYers, mechanics, and body shops across all 50 states.
If it doesn't fit, we make it right. No gimmicks, no fine print.
Most retailers stop at 30 days. We give you a full four months to install, test, and return for a 100% refund — return shipping on us.
Brand-new aftermarket parts from trusted suppliers — built to original-equipment specifications so they fit and function like the factory unit, at a fraction of the price.
