AUTO PART
NGK Spark Plug 91731
Spark Plug, SILKGR9A7EG, Laser Iridium
Manufacturer Part Number91731
Part TypeSpark Plug
BrandNGK
Verified vehicle applications are listed below. Match your exact vehicle configuration before ordering.
Confirm year, make, model, engine and drivetrain before ordering.
Confirm year, make, model, engine and drivetrain before ordering.
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.
Buy Online Pick Up In-Store
Address
101 Trillium Dr
Kitchener, Ontario N2E 1W8
Kitchener, Ontario N2E 1W8
Phone
Hours
Mon–Fri 9 AM–5 PM • Sat 9 AM–1 PM
All brand names are the property of their respective owners and are used for compatibility reference only.
- Choosing a selection results in a full page refresh.
