Increased performance with World’s smallest Iridium Center Electrode (0.4mm).
- No-compromise, top of the line race spark plug for the most serious enthusiast.
- Patented U-groove ground electrode design fires leaner mixtures than conventional plugs
- Precision machine-rolled threads reduce seizing and cross-threading in delicate aluminum heads
- Wide range of part numbers for thousands of applications, including classic and collector cars
- Lasts twice as long as most conventional plugs
- Withstands temperatures greater than 4000° Fahrenheit
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