NGK

NGK Iridium IX Spark Plug Box of 4 (TR55-1IX)

$37.99
Use metafields to highlight unique selling points
Use metafields to highlight unique selling points

Pickup currently unavailable

Description

NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.

  • RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs
  • Trivalent metal plating for superior anti-corrosion and anti-seizing properties
  • Outstanding acceleration, high fuel efficiency and durability
  • Fine iridium tip ensures durable and consistent spark

This Part Fits:

Year Make Model Submodel
1994 Buick Century Custom
1996 Buick Century Limited
1994-1996 Buick Century Special
1994-1996 Chevrolet Beretta Base
1995-1997 Chevrolet Cavalier Base
1995-1997 Chevrolet Cavalier LS
1994,1997 Chevrolet Cavalier RS
1994 Chevrolet Cavalier VL
1994-1996 Chevrolet Corsica Base
1994-1995 Chevrolet LLV Base
1994-1997 Chevrolet S10 Base
1994-1997 Chevrolet S10 LS
1987-1991 Ford Country Squire Base
1987-1991 Ford Country Squire LX
2003 Ford E-150 Base
2003 Ford E-150 Club Wagon Chateau
2003 Ford E-150 Club Wagon XL
2003 Ford E-150 Club Wagon XLT
1998-2002 Ford E-150 Econoline Base
1998-2000 Ford E-150 Econoline XL
1998-2002 Ford E-150 Econoline Club Wagon Chateau
1998-2000 Ford E-150 Econoline Club Wagon Custom
2001-2002 Ford E-150 Econoline Club Wagon XL
1998-2002 Ford E-150 Econoline Club Wagon XLT
2003 Ford E-250 Base
1998-2002 Ford E-250 Econoline Base
1998-2000 Ford E-250 Econoline XL
1991-1997 Ford Escort Base
1991-2000 Ford Escort LX
1991-1995 Ford Escort LX Sport
1998-1999,2001-2002 Ford Escort SE
1996-1997 Ford Escort Sport
2006-2010 Ford Explorer Eddie Bauer
2006-2010 Ford Explorer Limited
2006 Ford Explorer XLS
2006-2010 Ford Explorer XLT
2007-2010 Ford Explorer Sport Trac Limited
2007-2010 Ford Explorer Sport Trac XLT
1998-2000 Ford F-150 Base
2005-2008 Ford F-150 STX
1998-2003,2005-2008 Ford F-150 XL
1998-2003,2005-2008 Ford F-150 XLT
2004 Ford F-150 Heritage XL
2004 Ford F-150 Heritage XLT
2000-2004 Ford Focus LX
2000-2003 Ford Focus SE
2006-2007 Ford Freestar Base
2006-2007 Ford Freestar Limited
2006-2007 Ford Freestar SE
2006-2007 Ford Freestar SEL
1985-1986 Ford LTD Base
1985-1986 Ford LTD Brougham
1986 Ford LTD Country Squire
1986 Ford LTD Country Squire LX
1986 Ford LTD Crown Victoria
1986 Ford LTD Crown Victoria LX
1987-1991 Ford LTD Crown Victoria Base
1987-1991 Ford LTD Crown Victoria LX
1987-1991 Ford LTD Crown Victoria S
1994-1997,2005-2010 Ford Mustang Base
1986 Ford Mustang GT
1985-1986 Ford Mustang LX
2001-2005 Ford Ranger Edge
2005-2009 Ford Ranger FX4
2006-2011 Ford Ranger Sport
2006-2007 Ford Ranger STX
2004 Ford Ranger Tremor
2001-2003,2005-2011 Ford Ranger XL
2001-2011 Ford Ranger XLT
1988-1995 Ford Taurus GL
1991 Ford Taurus L
1988-1995 Ford Taurus LX
1995 Ford Taurus SE
1985-1992 Ford Thunderbird Base
1985-1986 Ford Thunderbird Elan
1985 Ford Thunderbird Fila
1985-1997 Ford Thunderbird LX
1985-1988 Ford Thunderbird Sport
1989-1995 Ford Thunderbird Super Coupe
1995 Ford Windstar Base
1995 Ford Windstar GL
1995 Ford Windstar LX
1994-1997 GMC Sonoma SL
1994-1997 GMC Sonoma SLE
1994-1997 GMC Sonoma SLS
1996-1997 Isuzu Hombre S
1996-1997 Isuzu Hombre XS
2006 Land Rover LR3 Base
2005-2007 Land Rover LR3 SE
1986-1994 Lincoln Continental Base
1991-1994 Lincoln Continental Executive
1986-1987 Lincoln Continental Givenchy
1988-1994 Lincoln Continental Signature
1986-1987 Lincoln Mark VII Base
1986-1987 Lincoln Mark VII Bill Blass
1985-1986 Lincoln Mark VII LSC
1986-1990 Lincoln Town Car Base
1986-1990 Lincoln Town Car Cartier
1990 Lincoln Town Car Cypress
1990 Lincoln Town Car Executive
1986-1990 Lincoln Town Car Signature
1989 Lincoln Town Car Signature SE
1990 Lincoln Town Car Touring Edition
2002-2009 Mazda B4000 Base
2001-2004 Mazda B4000 DS
2001,2003-2008 Mazda B4000 SE
1986 Mercury Capri 5.0
1984-1986 Mercury Capri GS
1987-1991 Mercury Colony Park GS
1987-1991 Mercury Colony Park LS
1985-1986 Mercury Cougar Base
1985-1992 Mercury Cougar LS
1987-1990,1993-1997 Mercury Cougar XR-7
1986 Mercury Grand Marquis Base
1986 Mercury Grand Marquis Colony Park
1987-1991 Mercury Grand Marquis GS
1986-1991 Mercury Grand Marquis LS
1983-1986 Mercury Marquis Base
1983-1986 Mercury Marquis Brougham
2006-2007 Mercury Monterey Luxury
2007-2010 Mercury Mountaineer Base
2006 Mercury Mountaineer Convenience
2006 Mercury Mountaineer Luxury
2007-2010 Mercury Mountaineer Premier
1988-1995 Mercury Sable GS
1988-1995 Mercury Sable LS
1991-1996 Mercury Tracer Base
1997-1999 Mercury Tracer GS
1997-1999 Mercury Tracer LS
1991-1999 Mercury Tracer Trio
1995-1996 Oldsmobile Cutlass Ciera Base
1994 Oldsmobile Cutlass Ciera S
1995-1997 Pontiac Sunfire SE

FAQ

How long does shipping take?


Most orders ship within 1–2 business days. Engines and oversized items may require additional handling time. You’ll receive tracking as soon as your order leaves our warehouse.

What happens if an item is backordered?


If a product is backordered, we’ll notify you right away with an estimated restock date. You can choose to wait, swap, or cancel.

How do I track my order?


Once your order ships, you’ll receive an email with tracking information. You can also log into your account anytime to check order status.


We’ve been in your shoes. From first bolt-ons to full custom builds, our crew can guide you the right way.


Every product we sell is chosen with one goal in mind: helping you build faster, stronger, and more reliable machines.


We team up with the best brands so you can build with confidence.

Search