Manufactures Proprietary Terms
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    • Special Plug Features
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    • Test Results and Media
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  • Pulstar Plugs in the Media

  • Autolite's spark plug change walk-through

  • Autolite's tune-up safety tips

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  • Pulstar Test Results - Dodge Hemi

  • Champion 7989 Demonstration


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  • NGK Racing Wires

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    • Center Electrodes
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  • trapezoid

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    • Resistor Types
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    • Precious Metal Types
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    • Plug Problems
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    • Oxygen Sensors
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  • stoichiometric

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  • Reading old oxygen sensors

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  • OE Identical Oxygen Sensor Installation Instructions

  • Universal O2 Sensor Installation Instructions


    • Manufacturer's Numbering System
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  • Splitfire

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    • Post Release Articles
  • K&N HP Gains - 1996-2007 Lotus Elise/Exige

  • K&N HP Gains - 1996-2008 Ford Mustang GT

  • K&N HP Gains - 2004-2008 Scion xB

  • K&N HP Gains - 2005-2007 Chevy Corvette

  • K&N HP Gains - 2005-2008 Chrysler 300C

  • K&N HP Gains - 2007 Hummer H3

  • K&N HP Gains - 2007 Nissan 350Z

  • K&N HP Gains - 2007 Scion tC

  • K&N HP Gains - 2007 Shelby Ford Mustang GT 500

  • K&N HP Gains - 2007-2008 Toyota Tundra

  • K&N HP Gains - Ford F-Series Trucks

  • K&N HP Gains - GM Diesel

  • K&N HP Gains - Honda Fit Performance Add-Ons

  • K&N New Product Release - 2005-2008 Mercedes Diesel

  • K&N New Product Release - 2007 Mini Cooper S

  • K&N New Product Release - 2007-2008 Mercedes AMG

  • K&N New Product Release - 2008 Hummer H3

  • K&N New Product Release - Lexus IS220

  • K&N New Product Release - Nissan Sentra 2.5L L4

  • K&N New Product Release - 2006-2008 BMW 3-Series

    		•
       

       
    JIS height
    JIS height

    ISO height
    ISO height

    		 ISO (International Standards Organization) is an international organization which establishes standards for the production of automobiles and their parts. The ISO height for a spark plug from the seat to the top of the terminal nut is 50.5mm (1.98").

    JIS (Japanese Industrial Standard) is a Japanese organization which establishes standards for the production of Japanese automobiles and their parts. The JIS height for a spark plug from the seat to the top of the terminal nut is 53mm (2.086").
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