Free Shipping on Auto Parts Orders Over $75.                           Order by 11 PM EST for Same Day Shipping!

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


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

    Extra Hot Heat Range

    NGK Spark Plugs BKR4EIX - NGK Iridium IX Spark Plugs
    739-BKR4EIX
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • ISO projected
  • Gasket seat
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Ships
    NGK Spark Plugs GR4IX - NGK Iridium IX Spark Plugs
    739-GR4IX
    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 LZTR4AIX-11 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    739-UR45IX
    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 UR4IX - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    739-BCPR5EIX-11
    Iridium IX Spark Plug
  • 14mm x 3/4" Reach
  • 5/8" Hex
  • JIS projected
  • Gasket seat
  • .044" Gap
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Ships
    NGK Spark Plugs BKR5EIX - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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
    Ships
    NGK Spark Plugs CR5HIX - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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
    Ships
    NGK Spark Plugs LFR5AIX-11 - NGK Iridium IX Spark Plugs
    739-LFR5AIX-11
    Iridium IX Spark Plug
  • 14mm x 26.5mm Reach
  • 5/8" Hex
  • Projected
  • Gasket seat
  • .044" Gap
  • Sold Individually
  • Was: $8.99
    Now: $5.99
    Ships
    NGK Spark Plugs LTR5IX-11 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    739-TR5-1IX
    Iridium IX Spark Plug
  • 14mm x .807" Reach
  • 5/8" Hex
  • Extended projection
  • Tapered seat
  • Sold Individually
  • $7.99
    Order Today Ships 02/15/16
    NGK Spark Plugs TR55-1IX - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    739-YR55IX
    Iridium IX Spark Plug
  • 14mm x .460" Reach
  • 5/8" Hex
  • Tapered seat
  • .059" Gap
  • Sold Individually
  • $7.99
    Order Today Ships 02/15/16
    NGK Spark Plugs YR5IX - NGK Iridium IX Spark Plugs
    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 - NGK Iridium IX Spark Plugs
    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

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