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NGK Iridium Spark Plug Set for your Nissan SR20DET. These are the only spark plugs we use in our motors. Heat range breakdown in as follows:
- Heat Range 6 for stock turbo 8-12psi
- Heat Range 7 for upgraded turbo 13-15psi
- Heat Range 8 for upgraded turbo 16-20psi
- Heat Range 9 for upgraded turbo 21+psi
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