Iridium IX Spark Plugs are the most technologically advanced high performance plugs available. Featuring a 0.6 mm iridium center electrode tip, they offer superior ignitability without sacrificing durability. The tapered ground electrode increases flame kernel expansion, while the superior heat range design is ideally suited to the demands of high performance environments. Specially designed to meet the needs of serious enthusiasts, Iridium IX Spark Plugs offer outstanding acceleration, high fuel efficiency and long life. When you demand the most from your engine, rely on the proven performance of NGK Iridium IX Spark Plugs. NGK's new Iridium IX is the personification of these qualities and takes premium performance spark plugs to a new level. A level that is expected from the world leader in spark plugs.
- Factory gapped to 0.044" for best performance... Plug and play for S13/S14/S15 SR20DE ! Beware of buying other plugs, you will need to MANUALLY re-gap them!
- Extract the most performance out of your engine with NGK IRIDIUM spark plugs!
- Available in heat range 6, 7, or 8 (Please choose accordingly)
- Comes in a set of four
| Year | Make | Model | Trim | App Notes |
| 1999 - 2002 | Nissan | Silvia | (S15) L4 2.0L SR20DE | None |
| 1994 - 1998 | Nissan | Silvia | (S14) L4 2.0L SR20DE | None |
| 1989 - 1993 | Nissan | Silvia | (S13) L4 2.0L SR20DE | None |
| 1989 - 1998 | Nissan | 180SX | (S13) L4 2.0L SR20DE | None |
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