NGK Iridium IX Spark Plug CADILLAC STS

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Part #: TR7IX
Notes: Iridium IX Spark Plug
MSRP: $20.43
Your Price: $15.91


Center Electrode Core Material Copper Core
Center Electrode Tip Material Iridium
Gap Size 0.04
Gap Size 0.040
Ground Configuration Standard
Ground Electrode Core Material Nickel Core
Ground Electrode Quantity 1
Ground Electrode Tip Design Taper Cut
Hex Size 5/8in
Insulator Height 53.00
Insulator Height ISO
Manufacturer Heat Range 7
Reach 17.5
Reach 17.5mm
Resistance 5K Ohm
Seat Type Tapered
Thread Diameter 0.551
Thread Diameter 14

All Fitments

Year Model SubModel Cylinders Liter Aspiration Eng Desg. Fuel Notes
2006 - 2009 STS ALL V8 4.4 ALL ALL ALL
2006 - 2009 XLR ALL V8 4.4 ALL ALL ALL

Product Description

Designed specifically for the performance enthusiast, NGK Iridium IX plugs offer super-efficient ignition, improved throttle response, and superior anti-fouling.


  • Fine Iridium tip ensures longevity.
  • Iridium alloy has an extremely high melting point, perfect for today’s high-tech performance engines.
  • “Trivalent Metal Plating” provides superior anti-corrosion and anti-seizing properties.
  • Outstanding acceleration, fuel efficiency, and durability.

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