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NGK Iridium IX Spark Plugs


NGK Spark Plugs
NGK Iridium IX Spark Plugs

Product images may differ from actual product appearance.

The Plug for Serious Enthusiasts
Iridium has a very high melting point that's perfect for high-performance, high-tech engines. It is stronger than any other metal used in spark plugs.

  • Ultra-fine electrode (thin enough for spark consistency & accuracy, thick enough for max durability & longevity)
  • Reduces spark voltage requirement
  • Fuel efficiency & extreme ignitability
  • Improved throttle response
  • Outstanding acceleration
  • Superior antifouling, anticorrosion, and antiseizing properties
  • Quality NGK Spark Plugs
  • Sold individually


  • 95 Products Page: 1 2 3 4 ... |  Next Results per Page:
    Extra Hot Heat Range
    NGK Spark Plugs BKR4EIX -
    739-BKR4EIX
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
  • Sold Individually
  • $9.99
    Order Today Ships 05/11/16
    NGK Spark Plugs GR4IX -
    739-GR4IX
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • Sold Individually
  • $9.99
    Ships
    NGK Spark Plugs LZTR4AIX-11 -
    739-LZTR4AIX-11
    Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • .044" Gap
  • Sold Individually
  • $10.99
    Ships
    NGK Spark Plugs TR4IX -
    739-TR4IX
    Iridium IX Spark Plug
  • 14mm x .708" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Ships
    NGK Spark Plugs UR45IX -
    739-UR45IX
    Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .059" Gap
  • Sold Individually
  • $9.99
    Order Today Ships 05/11/16
    NGK Spark Plugs UR4IX -
    739-UR4IX
    Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • Sold Individually
  • $10.99
    Ships
    NGK Spark Plugs XR45IX -
    739-XR45IX
    Iridium IX Spark Plug
  • 14mm x 3/8" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • .059" Gap
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Ships
    NGK Spark Plugs XR4IX -
    739-XR4IX
    Iridium IX Spark Plug
  • 14mm x 3/8" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • Sold Individually
  • $7.99
    Ships
    Hot Heat Range
    NGK Spark Plugs BCPR5EIX -
    739-BCPR5EIX
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • JIS projected
  • Gasket seat
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Ships
    NGK Spark Plugs BCPR5EIX-11 -
    739-BCPR5EIX-11
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • JIS projected
  • Gasket seat
  • .044" Gap
  • Sold Individually
  • $8.99
    Ships
    NGK Spark Plugs BKR5EIX -
    739-BKR5EIX
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
  • Sold Individually
  • $7.99
    Ships
    NGK Spark Plugs BKR5EIX-11 -
    739-BKR5EIX-11
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
  • .044" Gap
  • Sold Individually
  • $10.99
    Ships
    NGK Spark Plugs BPR5EIX -
    739-BPR5EIX
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Ships
    NGK Spark Plugs BPR5EIX-11 -
    739-BPR5EIX-11
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • .044" Gap
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Order Today Ships 05/09/16
    NGK Spark Plugs CR5HIX -
    739-CR5HIX
    Iridium IX Spark Plug
  • 10mm x 1/2" Reach
  • 5/8" Hex
  • Gasket seat
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Ships
    NGK Spark Plugs GR5IX -
    739-GR5IX
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Order Today Ships 05/11/16
    NGK Spark Plugs LFR5AIX-11 -
    739-LFR5AIX-11
    Iridium IX Spark Plug
  • 14mm x 26.5mm Reach
  • 5/8" Hex
  • Projected
  • Gasket seat
  • .044" Gap
  • Sold Individually
  • $9.99
    Ships
    NGK Spark Plugs LTR5IX-11 -
    739-LTR5IX-11
    Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .044" Gap
  • Sold Individually
  • $7.99
    Ships
    NGK Spark Plugs LZTR5AIX-13 -
    739-LZTR5AIX-13
    Iridium IX Spark Plug
  • 14mm x 25mm Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • .052" Gap
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Ships
    NGK Spark Plugs TR5-1IX -
    739-TR5-1IX
    Iridium IX Spark Plug
  • 14mm x .807" Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • Sold Individually
  • $8.99
    Order Today Ships 05/11/16
    NGK Spark Plugs TR55-1IX -
    739-TR55-1IX
    Iridium IX Spark Plug
  • 14mm x .807" Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • .059" Gap
  • Sold Individually
  • $7.99
    Ships
    NGK Spark Plugs TR55IX -
    739-TR55IX
    Iridium IX Spark Plug
  • 14mm x .708" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .059" Gap
  • Sold Individually
  • $7.99
    Ships
    NGK Spark Plugs TR5IX -
    739-TR5IX
    Iridium IX Spark Plug
  • 14mm x .708" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • Sold Individually
  • $7.99
    Ships
    NGK Spark Plugs UR55IX -
    739-UR55IX
    Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • .059" Gap
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Ships
    NGK Spark Plugs UR5IX -
    739-UR5IX
    Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Projected
  • Tapered seat
  • Sold Individually
  • $10.99
    Ships
    NGK Spark Plugs WR5IX -
    739-WR5IX
    Iridium IX Spark Plug
  • 18mm x .460" Reach
  • 13/16" Hex
  • Projected
  • Tapered seat
  • Sold Individually
  • $7.99
    Ships
    NGK Spark Plugs XR5IX -
    739-XR5IX
    Iridium IX Spark Plug
  • 14mm x 3/8" Reach
  • 13/16" Hex
  • Projected
  • Gasket seat
  • Sold Individually
  • $7.99
    Ships
    NGK Spark Plugs YR55IX -
    739-YR55IX
    Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Tapered seat
  • .059" Gap
  • Sold Individually
  • $8.99
    Order Today Ships 05/11/16
    NGK Spark Plugs YR5IX -
    739-YR5IX
    Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Tapered seat
  • Sold Individually
  • $7.99
    Ships
    NGK Spark Plugs ZFR5FIX-11 -
    739-ZFR5FIX-11
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO extended projection
  • Gasket seat
  • .044" Gap
  • Sold Individually
  • $7.99
    Ships

    95 Products Page: 1 2 3 4 ... |  Next Results per Page: