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NGK
NGK 97506 1-Step-Colder Iridium Spark Plugs — N55 Set of 6
The plug N55 tuners actually run. Set of 6, heat range 8.
Beginner install
SKU: 97506
$99.99USD
Price atAmazon· may change
Genuine NGK 97506 (SILZKBR8D8S) — heat range 8
1-step colder than OEM for boosted N55
Laser-iridium tip for long service life
Re-gap to ~0.022–0.024" for tuned / E85 builds
The tuner-recommended N55 plug
Set of 6 — covers all cylinders
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Compatible with 15 BMW N55 models. Includes F10 535i, F30 335i, F32 435i and all N55 platforms. /
On a boosted or E-fuel N55, the OEM plugs become the ignition limit. The NGK 97506 (model SILZKBR8D8S) is a laser-iridium plug one heat-range colder (range 8) than stock — the plug every major N55 tuner recommends before adding power. It ships pre-gapped around 0.028–0.030"; for tuned / upgraded-turbo / E85 builds the recommended re-gap is roughly 0.022–0.024" (gap on install). This listing is a full set of 6 for all N55 cylinders.
Key highlights
Genuine NGK 97506 (SILZKBR8D8S) — heat range 8
1-step colder than OEM for boosted N55
Laser-iridium tip for long service life
Re-gap to ~0.022–0.024" for tuned / E85 builds
The tuner-recommended N55 plug
Set of 6 — covers all cylinders
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