Sold as a set of 6 Spark Plugs:

For years we searched for the "right" plug for high HP, high boost applications on our own Zs. After testing numerous spark plugs we found the absolute best plug money can buy. Trying to find an adequate plug colder than the PFR6B-11B proved to be tough, but these plugs deliver the best spark around. BKR6, 7, 8 and 9.

Heat Ranges Available:

• The "8" heat range is also a great all around performer. Allows one to run higher boost levels than 20+ safely, yet is hot enough for daily street use. Perfect plug for California style climates all year round. Works good with low nitrous shots too. We use this heat range in most of our tuned Z32s.
  

All plugs come pre-gapped anywhere from .028' to .032", no gapping required! Simply double check the gap and your ready to go!