# NGK Iridium IX Spark Plug Box of 4 (TR4IX) 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 1987-1989,1993 Buick Century Custom 1987-1988 Buick Century Estate Wagon 1987-1989,1993 Buick Century Limited 1993 Buick Century Special 2009-2011 Buick Lucerne CX 2009-2011 Buick Lucerne CXL 2010 Buick Lucerne CXL Special Edition 1988-1993 Buick Regal Custom 1989 Buick Regal Gran Sport 1988-1993 Buick Regal Limited 1987-1989 Buick Skyhawk Custom 1987 Buick Skyhawk Limited 1988-1989 Buick Skyhawk SE 1987 Buick Skyhawk Sport 1987 Buick Skyhawk T-Type 2006-2007 Buick Terraza CX 2006-2007 Buick Terraza CXL 1987-1988 Cadillac Cimarron Base 1987-1993 Chevrolet Beretta Base 1989-1993 Chevrolet Beretta GT 1991-1993 Chevrolet Beretta GTZ 1990 Chevrolet Beretta Indianapolis 500 Pace Car 1987-1990 Chevrolet Cavalier Base 1987 Chevrolet Cavalier CS 1987-1994 Chevrolet Cavalier RS 1988-1993 Chevrolet Cavalier VL 1987-1994 Chevrolet Cavalier Z24 1987-1990 Chevrolet Celebrity Base 1989 Chevrolet Celebrity CL 1987 Chevrolet Celebrity Estate 1987-1990 Chevrolet Celebrity Eurosport 1987-1989 Chevrolet Corsica Base 1987-1988,1990-1993 Chevrolet Corsica LT 1989-1990,1992 Chevrolet Corsica LTZ 2008 Chevrolet Impala 50th Anniversary Edition 2006-2011 Chevrolet Impala LS 2006-2011 Chevrolet Impala LT 2006-2011 Chevrolet Impala LTZ 2006-2011 Chevrolet Impala Police 1990-1994 Chevrolet Lumina Base 1990-1994 Chevrolet Lumina Euro 2008 Chevrolet Malibu Classic LS 2008 Chevrolet Malibu Classic LT 2007-2010 Chevrolet Malibu LS 2007,2009 Chevrolet Malibu LT 2007 Chevrolet Malibu LTZ 2007 Chevrolet Malibu Maxx LS 2007 Chevrolet Malibu Maxx LT 2007 Chevrolet Malibu Maxx LTZ 2006-2007 Chevrolet Malibu Maxx SS 2006-2007 Chevrolet Malibu SS 2006-2007 Chevrolet Monte Carlo LS 2006-2007 Chevrolet Monte Carlo LT 2006 Chevrolet Monte Carlo LTZ 2007-2008 Chevrolet Uplander Base 2007-2008 Chevrolet Uplander LS 2006-2008 Chevrolet Uplander LT 1988-1989,1993 Oldsmobile Cutlass Ciera Base 1987-1988 Oldsmobile Cutlass Ciera Brougham 1987 Oldsmobile Cutlass Ciera GT 1987-1988 Oldsmobile Cutlass Ciera LS 1987-1988,1993 Oldsmobile Cutlass Ciera S 1987-1989 Oldsmobile Cutlass Ciera SL 1989 Oldsmobile Cutlass Cruiser Base 1987 Oldsmobile Cutlass Cruiser Brougham 1988 Oldsmobile Cutlass Cruiser Brougham LS 1987-1988 Oldsmobile Cutlass Cruiser LS 1988-1989 Oldsmobile Cutlass Cruiser SL 1988-1993 Oldsmobile Cutlass Supreme Base 1988 Oldsmobile Cutlass Supreme Indy 500 Pace Car 1988-1993 Oldsmobile Cutlass Supreme International 1992-1993 Oldsmobile Cutlass Supreme S 1988-1991 Oldsmobile Cutlass Supreme SL 1987-1988 Oldsmobile Firenza Base 1987-1988 Oldsmobile Firenza Cruiser 1987 Oldsmobile Firenza GT 1987 Oldsmobile Firenza LC 1987 Oldsmobile Firenza LX 1987 Oldsmobile Firenza S 1987-1988 Pontiac 6000 Base 1987-1991 Pontiac 6000 LE 1987-1988 Pontiac 6000 SE 1989-1991 Pontiac 6000 Special Edition 1987-1989 Pontiac 6000 STE 2007-2010 Pontiac G6 Base 2007-2010 Pontiac G6 GT 2006 Pontiac G6 GTP 1988-1989 Pontiac Grand Prix Base 1991-1993 Pontiac Grand Prix GT 1988-1993 Pontiac Grand Prix LE 1988-1993 Pontiac Grand Prix SE 1990-1993 Pontiac Grand Prix STE 2006 Pontiac Montana SV6 1991-1994 Pontiac Sunbird GT 1991,1994 Pontiac Sunbird LE 1993 Pontiac Sunbird LE Value Leader 1991-1994 Pontiac Sunbird SE 2007-2008 Saturn Aura XE 2007 Saturn Relay 1 2007 Saturn Relay 2 2006-2007 Saturn Relay 3 2008-2010 Saturn Vue XE ## Details - **Price:** 74.61 CAD - **Vendor:** NGK - **Type:** Spark Plugs ## Variants | Variant | Price | Available | |---------|-------|-----------| | Default Title | 74.61 CAD | In stock | ## Images - Photo - Primary - Photo - Primary - Photo - out of package - Photo - out of package --- > Source: [Standard Auto Part](https://www.standardautopart.com/products/ngk-iridium-ix-spark-plug-box-of-4-tr4ix) > Updated: 2026-06-28