When taking the Nissan 300zx to high boost you should recommend getting a spark plug that will handle the increased spark that is required. These NGK spark plugs are the plugs needed when going to higher boost levels.
For choosing the correct heat range:
Nissan OEM PFR6B-11B
"6" Heat Range should be used for stock turbos up to 15 Lbs of boost."7" Heat Range:
Stock Turbos (15+ PSI), Sport 500s. 530s, & 600s. Great for street use."8" Heat Range:
For those who race at high boost levels and any upgraded turbochargers. Good for nitrous as well. Great for street use."9" Heat Range:
Race use only! Great for high boost and nitrous use. Not recommended for daily driving.
These plugs come pre-gapped to .030" so no gapping is required!Price is for a set of 6 Plugs**** Free Ground shipping in the contiguous U.S.. Please contact us for a quote for shipping outside the contiguous U.S. or for express shipping ****