AUTOMOTIVE PART
NGK Spark Plug 91731
Spark Plug, SILKGR9A7EG, Laser Iridium
Part 91731NGKSpark Plug
Match your exact vehicle configuration to the verified applications below.
Confirm the year, make, model, engine, drivetrain and required position before ordering.
Confirm the year, make, model, engine, drivetrain and required position before ordering.
Is This the Right Part?
Manufacturer Part Number91731
ManufacturerNGK
Part TypeSpark Plug
Part Details
Part Specifications
| Center Electrode Core Material | Copper |
|---|---|
| Center Electrode Tip Material | Iridium |
| Electrical Terminal Type | Cup |
| Ground Configuration | J-Gap |
| Ground Electrode Core Material | Copper |
| Ground Electrode Quantity | 1 |
| Ground Electrode Tip Design | Projected Square Platinum Electrode (PSPE) - High Ignitability |
| Hex Size | 14mm Bi-Hex |
| Insulator Height | 2.01 IN |
| Insulator Material | Ceramic |
| Manufacturer Heat Range | 9 |
| Material Grade | Iridium Platinum |
| Part Number | SILKGR9A7EG |
| Pre-Gap Size | .028 IN |
| Reach | 1.043 IN |
| Resistance | 5000.0 82 |
| Resistor Type | Yes |
| Seat Type | Flat |
| Short Style Spark Plug | No |
| Stock Number | 91731 |
| Thread Diameter | 0.472 IN |
| Thread Diameter | 12.0 MM |
Verified Vehicle Fitment
Make: Porsche
Model: 2 verified models — see exact combinations below.
Years: 2017–2024 — varies by model and configuration.
Check before ordering: Match the year, make, model, position, and every engine, transmission or other restriction in the same row. Listed years do not apply to every model.
View vehicle applications (4 configuration groups)
| Years | Make | Model | Position | Engine / transmission / notes |
|---|---|---|---|---|
| 2021–2024 | Porsche | 718 Boxster | — | Engine: 2.5 H4; Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs., 40,000 mi Factory Recommended Service Interval, Gap 0.028in |
| 2017–2020 | Porsche | 718 Boxster | — | Engine: 2.5 H4; Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs., 40,000 mi OE Mfr Recommended Service Interval, Gap 0.028in |
| 2021–2024 | Porsche | 718 Cayman | — | Engine: 2.5 H4; Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs., 40,000 mi Factory Recommended Service Interval, Gap 0.028in |
| 2017–2020 | Porsche | 718 Cayman | — | Engine: 2.5 H4; Actual OE Manufacturer; OE Spark Plug Is High Ignitability. For Optimal Performance, Replace With High Ignitability Spark Plugs., 40,000 mi OE Mfr Recommended Service Interval, Gap 0.028in |
Source: supplier-verified applications for NGK 91731. A vehicle not listed is not confirmed compatible.
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